# What's the circumference of a circle with a diameter of 7. Using pie as 3

12,182 questions
1. ## Maths

Pie=circumference of circle / Diameter of circle Then why pie is irrational no.

asked by Sushma on July 4, 2018
2. ## Algebra

The Circumference and area of a circle of radius r are givin by 2 [pie] r and [pie] r, respectively use 3.14 for the constant [pie] A. What is the circumference of a circle with a radius of 2 m? B.What is the area of a circle with a radius of 2 m? C.

asked by Jordan on September 17, 2007
3. ## Math

What's the circumference of a circle with a diameter of 7. Using pie as 3.

asked by Bee on December 14, 2010
4. ## Math

The circumference of a circle varies directly from its diameter. If the circumference of the circle having a diameter of 7cm is 7 cm, what is the circumferences of the circle whose diameter is 10cm? 18cm? 20cm? a. Write a mathematical statement that relate

asked by Jennylyn on September 19, 2015
5. ## math

The circumference of a circle varies directly from its diameter. If the circumference of the circle having a diameter of 7cm is 7 cm, what is the circumferences of the circle whose diameter is 10cm? 18cm? 20cm? a. Write a mathematical statement that relate

asked by =) on August 21, 2014
6. ## math

Find the circumference of the circle. using 3.14 as pie and round to the nearest hundredth. The diameter is 14.9 in

asked by max on March 29, 2016
7. ## math

What is the circumference of the circle if the diameter is 63ft. use 3.14 for pie and round to the nearest hundredth.

asked by max on March 29, 2016
8. ## math

how do you find the diameter of a circle if you don't have the radius? the circumference is 628 cm. Divide the circumference by pi, which is 3.14 (approximately). That will give you the diameter. Circumference = pi * D

asked by prince on February 15, 2007
9. ## Algebra

The circumference of a circle is found by the formula C=pi(d) where d is the diameter of the circle. Does circumference vary directly as diameter? If so what is the constant of variation

asked by M on October 14, 2014
10. ## college algebra

The diameter of the Earth is approximately 7,920 miles. Given that the circumference of a circle is pi times its diameter, which statement best describes the length of a trip from Washington to Masdagascar that is approximately 8,600 miles long? a.One

asked by Anonymous on August 29, 2006
11. ## Math

The radius of a circle is decreasing at a constant rate of 0.1 centimeters per second. In terms of the circumference C, what is the rate of the area of the circle, in square centimeters per second? a. -(0.2)pie C b. -(0.1)C c. -(0.1)C/2 pie d. (0.1)^2C e.

asked by Naz on January 18, 2011
12. ## AP Calculus

The radius of a circle is decreasing at a constant rate of 0.1 centimeters per second. In terms of the circumference C, what is the rate of the area of the circle, in square centimeters per second? a. -(0.2)pie C b. -(0.1)C c. -(0.1)C/2 pie d. (0.1)^2C e.

asked by Naz on January 18, 2011
13. ## AP Calculus

The radius of a circle is decreasing at a constant rate of 0.1 centimeters per second. In terms of the circumference C, what is the rate of the area of the circle, in square centimeters per second? a. -(0.2)pie C b. -(0.1)C c. -(0.1)C/2 pie d. (0.1)^2C e.

asked by Naz on January 18, 2011
14. ## Math

Students in Mr.Tandoc's shop class made a circular railroad crossing sign for a school play. The diameter of the sign was about 4 feet. How does the diameter compare to the circumference of the sign? A.The diameter is about 1/3 of the circumference B.The

asked by Jerald on January 26, 2013
15. ## Math

Students in Mr. Tandoc's shop class made a circular railroad crossing sign for a school play. The diameter of the sign was about 4 feet. How does the diameter compare to the circumference of the sign? A. The diameter is about 1/3 of the circumference B.The

asked by Jerald on January 28, 2013
16. ## Math--need help fast

If the radius of a circle is x/6, what's the diameter and circumference? Diameter = 2*r Circumference = 2*pi*r ...or... Circumference = pi*d Note: I'm using * to mean multiply. Can you now determine what you need to know with this information? Not really.

asked by Emily on March 7, 2007

c (circumference) c=pie d where d is the diameter. How do i find d to the nearest hundredth when c=39cm? and i have to solve the formula C=pie d for d.

asked by tito on October 14, 2008
18. ## Math

Jason drew two circles. the diameter of the larger circle is twice the diameter of the smaller circle. What is the ratio of the circumference of the smaller circle to the circumference of the larger circle?

asked by Anonymous on March 30, 2014
19. ## math

the radius of semi circle is 30 cm.Find its circumference Note:what formula can i use (pie*r + 2r) or (pie*r + r)

asked by kelvin on August 15, 2016
20. ## Math

A circle has an area of pie cm square what is its circumference in terms of pie

asked by Chimi on August 4, 2015
21. ## math

Okay. So i'm doing this project for my geometry class about different sports, soccer, baseball, basketball, bowling, golf, volleyball and pool. I have to find the surface area, volume, diameter, circumference, and radius of each of the balls. I got a

asked by Emily on May 23, 2007
22. ## geometry

how do you find the circumference of a circle with the area of 169 pie m squared(in the terms of pie)? Please tell me how to do it. Don't just give me the answer

asked by jordan on January 12, 2009
23. ## math

a percan pie 40 ft in diameter was baked in oklahoma,in 1989. What was the pie circumference ,rounded to the nearest foot? plz shoe work

asked by daisy on March 1, 2011
24. ## Geometry

I need help on a problem that's on formula for circumference. A circle has a circumference of 36 cm. find it's radius .but it says give an exact answer in simplest form and it says enter pi for the symbol of pie .

asked by Nancy on June 22, 2012
25. ## Physics

I have to design a laboratory activity to answer the question, "What is the relationship between the diameter of a circle and the area of the circle?" My teacher said to use a previous activity as a templete to help me. For the previous activity you had to

asked by Jim on April 1, 2009
26. ## math

I'm asked to find the circumference of a circle to the nearest tenth and the area of the same circle to the nearest hundredth. The circle has a diameter of 30 and a radius of 15. I got a circumference of 94.2 and an area of 188.48cm2 with these formulas:

asked by jon on December 16, 2009
27. ## math

A segment with endpoints C(-3, 3)and D(7, 3) is the diameter of a circle. a. What is the center of the circle? b. What is the length of the radius? c. What is the circumference of the circle? d. What is the equation of the circle?

asked by Joshua on March 21, 2018
28. ## Math

the ratio of circumference of a circle to its diameter is 22:7. what is the circumference of a curcle of the diameter 15.6m?

asked by Silvanus on April 15, 2013
29. ## math

The diameter of the Earth is approximately 7920 miles. Given that the circumference of a circle is _ times its diameter, which statemnt best describles the length of a trip from Washington to Madagascar that is approximately 8600 miles long? Your question

asked by trina on August 25, 2006
30. ## Math

If the circumference of a circle is 18 ( pie symbol), what is the area of the circle? Thanks

asked by Mom B on April 8, 2014
31. ## Math

For any circle, which ratio is equal to the number π? Select all that apply. ***A. Circumference ------------------- Diameter B. Circumference ------------------- Radius ***C. Circumference ------------------- 2 Times Radius D. Radius Squared

asked by Jaxx on August 30, 2019
32. ## math

How is the circumference of a circle with radius 9cm related to the circumference of a circle with diameter 9cm? i don't understand this.Help?? Thanks:)

asked by jamie on November 26, 2008
33. ## math

Sorry I'm posting again-- I just thought it would increase my chances of getting my question answered if i posted it in the mathematics portion of the website also. --------------------------------------- One can of pumpkin pie mix will make a pie of

asked by Emily on March 8, 2008
34. ## Circumference and Area of Circles

can someone help me with these:Find the radius, diameter and circumference of a circle with an area of 64 cm2. Write your answers as decimals rounded to the nearest hundredth. Find the circumference and area of a circle that has a rectangle inscribed

asked by mike on May 8, 2007
35. ## geometry

A pizza has a diameter of 12 . What is its circumference? Use the value for 3.14 , for pie

asked by Anonymous on February 4, 2011
36. ## geometry

A pizza has a diameter of 12 . What is its circumference? Use the value for 3.14 , for pie

asked by Anonymous on February 4, 2011
37. ## Math

Differentiate 2 pie r .i.e circumference of a circle

asked by Afeez on March 11, 2016
38. ## math algebra?

A circle has circumference of 56.52 ft. What is its area? Use 3.14 for pie.

asked by Lycia on June 3, 2014
39. ## Geometry

One can of pumpkin pie mix will make a pie of diameter 8 in. If two cans of pie mix are used to make a larger pie of the same thickness, find the diameter of that pie. Use sqrt 2 is equal to about 1.414

asked by Emily on March 8, 2008
40. ## geometry

The radius of a circle is 10. Using π, which equation expresses the ratio of the circumference of the circle to the circle's diameter? please help me

the circumference of circle j is 24 pie. what is the perimeter of jkl

asked by Nathan on November 18, 2010
42. ## math

how do i solve the problem what is the radius of a circle with a circumference of 24 pie

asked by Laney on September 27, 2008
43. ## Math

23.What is the approximate circumference of a circle with a radius of 6 centimeters? A.12 B.18 C.24 D.36 D 24.What is the length of the diameter if the radius is 15? A.5 B.15 C.30 D.45 C 27.What is the circumference of the circle velow if it has a radius

asked by Jerald on March 23, 2013
44. ## math

what is the diameter of a circle whose circomfrence is about 15.7 cm. divide the circumference by PI Divide the circumference by pi = 3.1416 to get the diameter

asked by butt on December 5, 2006
45. ## Geometry

Find the radius of a circle whose circumference is 37.3cm (Take pie =3.14cm)

asked by Yukti behl on November 4, 2016
46. ## math

find the area and circumference of the circle. Use 3.14 for pie and round to the nearest hundreth

asked by max on March 29, 2016
47. ## math

The number of square units in the area of circle P is equal to the number of units in the circumference of circle P. Assuming that the diameter of the circle must be greater than P, what is the radius of circle P ? a. 2 b. 2 pi c. 4 d. 4 pi e. cannot be

asked by Thomas on December 8, 2013
48. ## Math

42is the diameter of a circle. Find the circumference of the circle to the nearest foot.

asked by Latoya on April 6, 2016
49. ## Math

The area of a circle is given by the expression pi(16x^2 - 40x + 25) . a) What is the diameter of the circle? b) What is its circumference?

asked by Henry P on May 27, 2012
50. ## Geometry

The endpoints of the diameter of a circle are at (1, 2) and (7, -6). What is the circumference of the circle, to the nearest tenth of a unit? 15.7 31.4 62.8 78.5 Please help?

asked by SkatingDJ on September 23, 2015
51. ## geometry

The endpoints of the diameter of a circle are at (1,2) and (7,-6). What is the circumference of the circle, to the nearest tenth of a unit.

asked by katy on September 15, 2015
52. ## Math

The diameter of a circle is 7 inches. What is the circumference of the circle rounded to the nearest thousandth?

asked by Anonymous on July 9, 2011
53. ## math

which of the following of a circle is always smaller than the other two? A the circumference B the diameter C the radius D it depends on the size of the circle

asked by zaira on October 27, 2008
54. ## Algebra

The circumference,y, of a circle varies directly with the diameter,x, of the circle. Write an equation if y=44cm when x=14cm.

asked by Austin on May 17, 2010
55. ## Geometry

the endpoints of the diameter of a circle are at (1,2) and (7, -6). what is the circumference of the circle, no the nearest tenth of a unit? 15.7 31.4 62.8 78.5 I was thinking B? i want to check.

asked by Roi on September 16, 2015
56. ## math

2/3x+5/3x=14 7\6x=14 then multiply a4 my 6\7 what is the circumferenceof a satellite dish which has a diameter of 21m you do 2 times pie and radius since you have the diameter then its 21 times pie . for futher info if your trying to find the area then you

asked by Anonymous on April 24, 2007
57. ## Precalculus

A line segment has endpoints A=(1,3) and B=(13,19). a) Find the equation of the circle for which the segment AB is a diameter. Ans: (x - 7)^2 + (y - 11)^2 = 100 b) Accurate to the nearest tenth, the circumference of this circle is _______ ? I was able to

asked by jh on March 9, 2010
58. ## Math

(Two concentric circles are shown)The smaller circle's circumference is 10pi. The chord's length is 24. What is the diameter of the larger circle.

asked by Hannah Montana on May 23, 2011
59. ## Math

The diameter of a circle is 60cm.find the angle which an arc of length 3.14cm subtends at the circle take pie equals 3.142

asked by Umaima on January 13, 2016
60. ## Physics

1. A Pyrex plate is filled to the brim with liquid pumpkin pie filling, then baked at 190 degrees Celsius. The pie plate is h=3.60 cm deep, but the sides of the dish taper from the top to bottom so that the bottom is a circle of diameter d2=25.8cm, while

asked by Dawna on January 22, 2013

The diameter of a penny is 3/4 in. How many pennies are needed to form a row 12in. long? Also to find the circumference of a circle do you use the radius or diameter x 3.14?

asked by jill on December 7, 2010
62. ## Math

If the diameter of a circle is 22 cm, what is the circumference of the circle and the area of the circle

asked by Carter on September 15, 2015
63. ## math

If a circle had a circumference of 8.4 cm, what is the diameter of the circle to the nearest 0.1 cm?

asked by vincent on July 28, 2013
64. ## Math

1. estimate the circumference of the circle with the given radius or diameter use 3.14 round to the nearest unit 24 27-in 78-in 1,809-in 151-in 2. estimate the radius of a circle circumference of 272.2-in. use 3.14 to round to the nearest tenth.

65. ## algebra

Mrs Acres will draw a circle on the playground for a game in gym class.The circle will havw a diameter of 16 feet.What is the circumference of the circle that Mrs Acres will paint?

asked by Katie on April 24, 2012
66. ## Math

What is the circumference of a circle with a diameter of 10 m.

asked by peter on January 17, 2011
67. ## Math

What is the circumference of a circle with a diameter of 10 m.

asked by nando on January 17, 2011

what is the circumference of a circle that has a diameter of 8 m

asked by jessica on May 17, 2010
69. ## math

circumference of a circle with the diameter of 47.10?

asked by Brenda on January 17, 2010
70. ## Math

What is the circumference of a circle with a diameter of 10 m.

asked by will on January 17, 2011
71. ## Math

what is the circumference of a circle that has a diameter of 16 mi?

asked by Judy on March 29, 2011
72. ## geometry

Given a circle with a diameter of 4, what is the circumference?

asked by zaylee on October 2, 2012
73. ## math/geometry

if the circumference of a circle is 12.56 m then what is its diameter?

asked by Anonymous on February 18, 2013
74. ## math

what is the circumference of a circle if 13 is the diameter

asked by Alisha on February 21, 2010
75. ## math

what is the circumference of a circle with a diameter of 50 mm

asked by Marc on May 21, 2016
76. ## college math

If a circle has the diameter of 8, what is the circumference

asked by Debra on September 11, 2008
77. ## math

Mrs.penn has a circular tablecloth with a circumference of 29 feet. Which expression could be used ro find the radius of the tablecloth? f. 29 - 2 pie g. 29/2 pie h. 29/pie j 29 + 2pie

asked by dylan on December 6, 2010
78. ## Math

1. estimate the circumference of the circle with the given radius or diameter use 3.14 round to the nearest unit 24 27-in 78-in 1,809-in

asked by Conuxes user 2 on April 5, 2019
79. ## math

A gear on a bicycle has the shape of a circle. One gear has a diameter of 4 inches, and a smaller one has a diameter of 2 inches. Justin says that the circumference of the larger gear is 2 inches more than the circumference of the smaller gear. Do you

asked by Tim on December 30, 2015
80. ## Math

Three circular pipes with 30cm diamters are strapped together. Find the length of the strap to the nearest centimeter. I got the circumference of the circle which is 94.25cm but that's where i got stuck. Can you please help? you are wrong sorry to tell ya.

asked by Shay on April 4, 2007
81. ## Math

23.What is the approximate circumference of a circle with a radius of 6 cmA.12cm B.18cm C.24cm D.36cm D 24.What is the length of the diameter of a circle with a 15 radius A.5 B.15 C.30 D.45 C

asked by Jerald on May 28, 2013
82. ## math

a race track is a mile around circle which equals 5,280 circumference. To find the diameter (the the width of the center of the circle) do I divide the 5,280 by 2?

asked by Sandy on March 4, 2013
83. ## physics

what is the magnitude of the displacement of a car that travels half a lap along a circle of radius 150m? would the answer be half of the circumference or would it be the diameter of the circle?

asked by Anonymous on October 19, 2008
84. ## Math

Find the circumference of the circle. Use 3.14 for π. Round to the nearest unit. (Show picture of circle with a diameter, with 21cm at one side) A) 24cm B) 66CM C) 125cm D) 69cm Please help me understand, that means don't tell me the answer without

asked by Sliverstream on April 11, 2019
85. ## prealgebra

asked by mikey on April 30, 2018
86. ## math

what is the exact circumference of a circle with a diameter of 13 inches?

asked by jenna on July 3, 2011
87. ## geometry

What is the exact circumference of a circle with a diameter of 15 inches.

asked by angela on June 19, 2012
88. ## boston high school

find the circumference of a circle if the diameter is 5.15 meters

asked by kels on December 9, 2015
89. ## MATH

FIND THE DIAMETER AND CIRCUMFERENCE OF A CIRCLE THAT HAS A RADIUS OF 1.7 USE 3.14 FOR PI

asked by MASON on December 13, 2010
90. ## math

Estimate the circumference of the circle with the given radius or diameter. Use 3.14 for

asked by aseease on April 24, 2016
91. ## maths

O is the centre of the circle and A and B are points on the circumference of the circle. The radians of the circle is 12 cm and the angle AOB is 54 degrees. Choose the one option which gives the length of the circle joining A and B , correct to one decimal

asked by katie on April 20, 2007
92. ## MATHS

find the area of a circle with diameter 50cm (take pie as 22/7)

asked by CHINELO on May 30, 2019
93. ## Math

Find the circumference of the circle. Use 3.14 for pi. Round to the nearest unit The circle only has the diameter which is 17cm Please do step by step so I understand it A)53cm B)227cm C)20cm D)27cm I think its B but I don't know. Please help

asked by ♡school lover♡ on April 13, 2019
94. ## math problem

The diameter of a circle is increased by enough to increase the circumference by 20%. By what % is the area of the circle increased ? ( Hint: Try a number like t=5.)

asked by Joel on February 17, 2013
95. ## math

the circumference of a circle is 120 millimeters. Which of the following inqualities is true for d, the diameter of the circle measured in millimeters? A. 10

asked by mary on May 5, 2014

The circumference of a circle is 12.56 centimeters. What is the approx. measure of the circle's radius? A. 2 B. 2.5 C. 4 D. 8 I think that the Diameter would be 4.18 so the radius would be 2.04 or rounded to 2.

asked by Missy on March 24, 2008
97. ## math

A regular hexagon is drawn inside of a circle so that each of its vertices touches the circle. The diameter of the circle is 4 centimeters and the perimeter of the hexagon is 12 centimeters. How much longer is the circumference of the circle than the

asked by Chris on April 30, 2014
98. ## Math

The formula to find the circumference of a circle that has a diameter of 34 inches?

asked by Agustin on March 16, 2009
99. ## Pre Algebra

find the radius and diameter of a circle with a circumference of 63m

asked by Gloria on April 12, 2011
100. ## geometry

The circumference of a circle is approximately 28.26 cm. Find its diameter and radius

asked by Cynthia on November 2, 2010