# math/ CIRCUMFERENCE of a circle

134,910 results

**Geometry**

A sphere has a great circle circumference of 40pi feet. What's its volume?

**boston high school**

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

**Geometric problem solving **

What is the area of a circle with a circumference of 2π^2 square meters?

**math**

Find the area of the following plane figure. A circle whose circumference measures 28 centimeters. Area (to the nearest square centimeter) =

**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. (0.1)^2 pie C

**math Lsson:11 unit 3**

1. estimate the circumference of the circle. use 3.14 as pi . round the nearest unit. The circle says 24. A. 27 b. 79 c.1,809 d. 151**** 2. Estimate the radius of a circle with the circumference of 272.2 inches. Use 3.14 for pi. Round to the nearest tenth. a. 43.3 b. 136.1 c. ...

**geometry**

A cone is created from a paper circle with a 90° sector cut from it. The paper along the remaining circumference of the circle is the base of the cone. Find the radius of the base of the cone. Round to the nearest hundredth.

**7th grade algebra**

Find the area of the circle with the given circumference C Use 3.14 for pi C=37.68

**geometry**

What's the circumference of a circle whose area equals 20x 3.14 cm squared in centimeters?

**Algebra**

For this circle, a 50 degree central angle cuts off an arc of 6 in. What is the circumference?

**geometry**

what is the area of a circle with a circumference of 22 pi in.? expressed in pi in. squared? and what are the steps to arrive at the solution?

**math**

a circular track has a radius of 100ft. elena wants to run 2 miles. There are 5,280 ft in a mile. Can you find the circumference of a circle if you know the radius? explain your answer

**math**

Problem 1:A semi-circular garden has a radius of 10 meters. What is its area? ( Use pi =3.14) Answer:157m^2 Problem 2:The base of a cylindrical tank has a radius of 4.5 meters. What is its area? ( Use pi=3.14) Answer:65.585m^2 Problem 3:In the middle of a field a huge circle ...

**Physics**

A ball on the end of a string travels in a horizontal circle at a constant speed. The circle has a circumference of 3 m, the ball has a speed of 2 m/s, and the centripetal force is 4 N. How much work is done on the ball each time it goes around? A) zero B) 6 J C) 8 J D) 12 J I...

**HELP11**

A line horizontally drawn from the center of the circle. A. Radius B. Axiom C. Circumference D. Vertex A

**Vocabulary**

A line horizontally drawn from the center of the circle. A. Axiom B. Vertex C. Circumference D. Radius D?

**Geometry**

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

**math**

The inner circumference of a circular track is 440 m. The track is 14 m wide. Find the diameter of the outer circle of the track.

**math**

The inner circumference of a circular track is 440 m. The track is 14 m wide. Find the diameter of the outer circle of the track.

**math**

A circle has an area of 25 pi cm^2.If a circle is drawn within that circle with a diameter equal to the radius of the first circle, what is the area of the second circle? a. 2 1/2 pi cm^2 b. 4 1/4 pi cm^2 c. 5 1/4 pi cm^2 d. 6 1/4 pi cm^2 e. 7 1/2 pi cm^2 please answer and ...

**Math**

Needing SERIOUS help with circumference and area circle-wise. Help? I'm not really sure where I'm messing up at, but could someone explain all the forumula stuff with area to me in layman's terms?

**5th grade math**

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?

**math**

A circular disc of area 49π sq. meters rolls down an incline of 88 km length. What is the number of revolution it makes during this journey? i) Area of the circle = πr² = 49π m²; solving r = 7 m. ii) So circumference of the circular disc = 2πr = 14π...

**Math**

I'm having problems with this question, to tell you the truth I don't understand the problem. Andrew is considering building a clubhouse in the shape of a rectangle. His sketch of the clubhouse is.... (its a drawing of a rectangle with 8 ft at the top and 4 ft on the left end)...

**pre algebra**

find the circumference and area of a circle if its diameter is 12 feet. round to the nearest tenth.

**pre algebra**

find the circumference and area of a circle if its diameter is 12 feet. round to the nearest tenth.

**10th grade**

If a circle has a diameter of 7inches, what is the circumference rounded to the nearest whole number? Use pi=3.14

**geometry**

An army base is enclosed by a wire fence so that it forms a circular compound. The entrance to the base is located at X(3, 6) and the exit is at Y(9, 14). X and Y are end points of a diameter of the circle. A search tower is positioned at Z(2, 13) on the circumference of the ...

**Math**

How do I measure the circumference of a circle without the given radius/diameter? How do I measure the actual distance between Grande Prairie and Medicine Hat? Map Scale: 1:18,300,000

**Geometry**

Find the circumference of a circle whose diameter is 2xR=4.2 ft. Use Pi = 3.14, and round the result to the nearest tenth.

**Algebra**

wht is the area of a circle with a circumference of 25 meters? I have to use pi(3.14) and round to the nearest square meter.

**TRIG**

find the degree measure of a central angle subtended by an arc of 8.00cm in a circle with circumference 20.0cm

**Algebra**

C=6.3r gives the approximate circumference C of a circle as a function of its radius r. Identify the independent and dependent variables in this relationship.

**Math**

Find the difference between the perimeter of a square of area 1 centimeter square and the circumference of a circle of the same area.

**Math**

Circle O is centered at the origin and has a radius of 5. Circle O' is the image of circle O after a translation of T1,2. What is the center of circle O'? What is the radius of circle O'?

**math**

a circle has a circumference of 110.6mm find diameter to the nearest tenth A.35.2mm b.36.2mm c.37.2mm d.38.2mm

**math**

27.What is the circumference of the circle below with a radius of 6yd. A.6pi yards B.12pi yards C.18pi yards C.36pi yards pi=3 for me right now

**MATH: Check my answers | HELP ASAP!!**

What is the diameter of a circle with a circumference of 282.6 m? Round your answer to the nearest meter. 4.5 m 9 m 90 m##### 45 m Check my answer please.

**summer math hw**

one circle has a diameter of 10 inches. a second circle has a diameter that is twice the diameter of the first circle What is the ratio of the area of the smaller circle to the larger circle

**Shape and Space**

The circumference of a mysterious crop circle measure 60 meters. What is the approximate radius,rounded to the nearest meter?

**geometry**

I don't get this and I need help please. Find the circumference of a circle circumscribed about a square with perimeter 48 ft. ______________ft. (Round to the nearest 0.1 ft.)

**math**

Whats the difference between an arc [of a circle]'s length and measure? And how do you find each of them? The "measure" of an arc is the angle that it subtends from the center of the circle. Call that angle A. The length of the arc is 2 pi R * [A/(2 pi)] = R*A, if A is in ...

**Math 10**

What is the circumference of the largest circle you could cut from a 30 cm by 20 cm sheet of paper? What area of paper would you cut away. PLZ HELP GUYS TEST TOMMOROW OH MA GAWD!

**Math**

4. Columbus had a hard time convincing anyone to undertake the expense of financing a voyage to an unknown place. Based on the information available from other sailors and partly on his own ideas, Columbus underestimated the circumference of the Earth by twenty-one percent. ...

**Math**

Hello, could someone please go over the steps for this question? Thank you! 1. Find the circumference. Leave your answer in terms of pi. The middle line going through the circle is 8.4 (I'm so sorry I don't know the name of the line, brain fart). A) 12.6 pi cm B) 4.2 pi cm C) ...

**6th Grade Geometry Help and A.S.A.P!!**

I forgot so, when calculating a circle's circumference, and area do you measure the circle in inches or centimeters? Also, calculating a rectangular prism's surface area and volume do you use inches or centimeters to measure it? Thanks. Please answer as soon as possible very ...

**precalculus**

I don't understand what steps I have to do in order to solve this problem. An angle's rays cut off an arc length of 227 centimeters in a circle with a 40 centimeter radius. A. What portion of the circle's circumference is cut off by this angle? B. What is the measure of this ...

**Math**

4. Columbus had a hard time convincing anyone to undertake the expense of financing a voyage to an unknown place. Based on the information available from other sailors and partly on his own ideas, Columbus underestimated the circumference of the Earth by twenty-one percent. ...

**Geometry**

Find the circumference of a circle whose diameter is 2xR=4.2 ft. Use Pi = 3.14, and round the result to the nearest tenth. would this be 3.14*2*4.2ft?

**Geometry**

Given circle A with circumference 20 pi and the length of arc KD equal to 10/3 pi. Find the area of the shaded region. >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> Is there any ...

**Trigonometry**

Determine the circumference of a circle with 7.4 centimeter radius. (Use 3.14 ) Im not trying to get this completely answered. I just need help with what to do first. Thank you so much.

**Math**

The area of a rectangle is shown below The area of the rectangle is 56 Which of the following are possible values for the length and width of the rectangle? A.length=6cm and width=9cm B.length=7cm and width=8cm C.length=14cm and width=14cm D.Length=28cm and width=28cm B? What ...

**trigonometry**

Gabe is spending two weeks on an archaeological dig. He finds a fragment of a circular plate that his leader thinks may be valuable. The arc length of the fragment is about 1/6 the circumference of the original complete plate and measures 1.65 inches. A similar plate found ...

**Math**

If the diameter of a wheel is 10 inches. What is the radius and how would I find its circumference. Thanks I do understand that the radius is twice the circumference.

**Math**

The rim of the basket has a radius of 9 inches. What is the approximate circumference of the basket? Use pi equals 3.14. Explain why 3.14 is used when finding the circumference of a circles.

**Math**

Find the area for the circle (use 3.14 for pi). Show your work. Round to the nearest tenth. the radius is 23 yd 22. Find the circumference of the circle (use 3.14 for pi). Show your work. Round to the nearest tenth. the raduis is 23 yd

**math**

the inner circumference of a ring is 1.2pi cm. the outer circumference of the ring is 2pi cm. find the area of the region bounded by the outer and inner circumference.

**Math2**

The scale of a globe is 1/8 inch= 125 miles. How many inches is the circumference of that globe? Hint 1: Circumference means distance around. Hint 2: Use 25,000 miles for the circumference of the Earth.

**Pre-Algebra**

Here are some more: 1.Use transformations to solve the equations: 5{6+k}=3k 19-3m+ 5+7m <0 2.Find the circumference of a circle with diameter 31 m. 3.What is 186% of 750? Thanks!! -MC

**Rai**

A particle covers an angle of 120¡ã while moving along the circumference of a circle. Find distance and displacement.

**Physics**

A particle covers an angle of 120¡ã while moving along the circumference of a circle. Find distance and displacement.

**math**

suppose you copy the circle using a size factor of 150%.what will bet he radius,diameter,circumference,and the area of the image? radius will be 1.5 times as big diameter will be 1.5 times as big but the formula for area will be pi times the radius squared. So calculate that ...

**mathematics**

The circle x2-2x+y2-4y-4=0 lies on the cartesian plane,question 2.1.1 equation of new circle which is the rotation of original circle through 180 degree around the origin...2.1.2 find equation of another circle which is the translation (x;y)-(x-8;y-6) of the points of the ...

**Geometry**

In my book there's a picture of an equalderal triangle. This is given information. Inside the triangle all three altitudes have been drawn to find the center point of gravity. The incircle is drawn. The circumcircle is drawn. Given that the radius of the incricle is 1, what is...

**Math**

The diameter of the planet Saturn is about 75,000 miles. The circumference of the planet can be found using the formula C=3.14d . What is the circumference in scientific notation ? Use 3.14 for ratio

**Pre-Calc (Circles)**

Describe the conditions necessary, where circle A has a larger radius than circle B, for the two circle to have no points of intersection, while circle B is entirely in the interior of circle A.

**math**

the radius of a circle when the numeric values of the circumference and area are equal. circumference = 2*pi*r area = pi*r^2 Set them equal and solve for r. thanks! i understand it now! 2*3.14*r=3.14*r^2 6.28*r=3.14*r^2 r=3.14 Is that right? It doesn't seem to be. 2*3.14*r=3....

**stats**

the head circumferences of adult males have a bell-shaped distribution with the mean= 65cm and standard deviation =2cm. a. what is the head circumference such that only 2.5% of adult males have a smaller head circumference? b. what is the head circumference such that only 2.5...

**Math**

True or false Some rational numbers are integers. The radius of a circle and its circumference. Direct or inverse f(x) 0.08x^3 + 0.6x + 2.8 Rational function, another polynomial function Quadratic function

**Math**

Some rational numbers are integers. True or false The radius of a circle and its circumference. Direct or inverse f(x) 0.08x^3 + 0.6x + 2.8 Rational function, another polynomial function Quadratic function.

**math**

Find the area for the circle (use 3.14 for pi). Show your work. Round to the nearest tenth. the radius is 23 yd 22. Find the circumference of the circle (use 3.14 for pi). Show your work. Round to the nearest tenth.

**7th grade**

if I have the circumference of a circle how do I find the diameter, and how do I find the radius

**Geometry**

The circumference of a circle changes from 20 to 4 after a dilation. What was the scale factor of the dilation? A. 1/25 B. 1/5 C. 5 D. 25

**geometry**

A circle has a circumference of 12. It has an arc of length 8/5 What is the central angle of the arc, in degrees?

**maths**

find the circumference of a circle whose radius is: 1. 8 inches 2. 4 inches

**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. (0.1)^2 pie C

**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. (0.1)^2 pie C

**Calculus**

The circumference of a circle is increasing at a rate of 2pi/5 inches per minute. When the radius is 5 inches, how fast is the area of the circle increasing in square inches per minute? A. 1/5 B. pi/5 C. 2 D. 2pi E. 25pi

**Maths**

There are 17 points on the circumference of a circle how many lines can be drawb to connect all possible pairs of points?

**math**

Two chords in a circle are equal in lengh.The distances from the centre of the circle can be represented by x2 and 4x respectively.How far is it chord from the centre of the circle?[Under the topic of properties of a circle.]

**geometry**

Circle O above has a circumference of 240 cm and arc XW has a length of 60 cm. What is the measure of the central angle associated with arc XW?

**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. the circumfrence of ...

**Physics**

A particle of mass m1 is tide to a string and describes a circumference on a horizontal plane. The string (of negligible mass)passes through a hole that is in the center of the plane and goes down vertically. At the lower end is tied another particle of m2. If the first ...

**algebra**

Hat sizes are determined by measuring the circumference of one's head in either inches or centimeters. Use ratio and porportion to complete the following table. hat size Head circumference 7 1/4 (to nearest 1/5inch) 7 1/8 22 4/5 Head circumference (to nearest centimeter) 58

**Math**

A square measures 12 cm x 12 cm and is divided into four equal squares.If equal circles inscribed within each of the four squares, what is the circumference of each circle ?

**Astronomy**

Calculate the approximate circumference of Earths orbit around sun, assuming that orbit is a circle with radius of 1.5 X 10 to the eighth.

**maths**

since a rectangle forms two area of a circle shouldn't it also form two circumference in a cylinder

**math**

A square measures 12 cm x 12 cm and is divided into four equal squares. If equal circles are incribed within each of the four squares, what is the circumference of each circle ? a. 2 pi cm b. 4 pi cm c. 6 pi cm d. 8 pi cm e. 12 pi cm please answer and explain

**math**

the center of three congruent small circles are collinear, and their diameters form the diameter of the large circle, shown, whose area is 81 pi units. what is the circumference of one of the smaller circles? express your answer in simplest radical form.

**Geometry**

Hello, Can you please tell me if I have the correct answer? Thank You my answer: 6m Find the diameter of a circle whose circumference is 18.85m.

**trig**

Points X, Y, and Z are on the circumference of a circle with radius 2 such that <YXZ = 45 degrees and <XZY = 60 degrees. Find the area of triangle XYZ.

**math**

(a) A circle has centre at (−2,−1). One point on its circumference is (−2, −3). Find its radius, correct to 1d.p. (b) If y = x2 for 0 £ x £ 2 is completely rotated round the x – axis, find the volume of the solid of revolution produced.

**circles**

if the circumference is estimated c=3*d and the exact circumference is c=pi*d what would be the radius and the diameter

**Math**

3.)Find the diameter of a circle with a circumference of 50 mm. Round your answer to the nearest tenth. A.)16.0 mm B.)26.4 mm C.)8.4 mm d.) 33.5 mm 4.)Find the area of the circle with the given radius or diameter. Round your answer to the nearest tenth. Diameter = 42.0 mm a) ...

**math**

I am supposed to find the area of a segment of a circle. The circle is cut with two radi with an angle of 90 degrees. Then where the radi touch the circle another line is drawn to connect them. The triangle and the small section between the triangle and the edge of the circle ...

**math**

I am supposed to find the area of a segment of a circle. The circle is cut with two radi with an angle of 90 degrees. Then where the radi touch the circle another line is drawn to connect them. The triangle and the small section between the triangle and the edge of the circle ...

**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

**maths help calculus**

the area of a circle increasing at the rate of 3cm/sec.find the rate of change of the circumference when the radius is 2cm help plz

**math/physics help plz**

Two cars moves around a circle of circumference 20 m with speed of 5m/s and 15m/s, if the positions of these cars are observed every integer seconds, after how many seconds will the cars occupy the same position. Help me show step

**6th grade math**

There are three crowns in the royal cabinet: One for the King, One for the Queen, and one for the Princess. The king's circumference was 21.98 in, the Queen's circumference was 43.96 cm and the Princess' circumference as 392.5 mm. What are the Diameters's for all three crowns?