serious math help!!!!!!!!!!!

Explain an easy way to estimate the
area and circumference of a circle
if you know the radius or diameter

  1. 👍
  2. 👎
  3. 👁
  1. The radius is 1/2 of the diameter, which is the width all the way across.

    Area = pi x radius^2
    Circumference = pi x diameter

    If you have the radius, you can figure you the circumference.

    Circ = pi x 2 x radius

    Vice versa for Area if you have the diameter (divide that by 2 and multiply it by pi)

    Matt

    1. 👍
    2. 👎
  2. If I am looking to estimate, I'd just square the radius (times it by itself) then mutiply by 3 for the area.
    I'd take the radius times two (or just take the diameter) and multiply by 3 to get the circumference. Since pi is a little over 3, your answers will be a little low but not bad for an estimate.

    1. 👍
    2. 👎

Respond to this Question

First Name

Your Response

Similar Questions

  1. Mathematics

    1. Find the circumference of the given circle. Round to the nearest tenth. (Circle with radius of 3.5 cm) -22.0 cm -38.5 cm -11.0 cm -42.8 cm 2. Find the area of the given circle. Round to the nearest tenth. (Circle with a

  2. 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.

  3. Math

    Circumference and Area of a Circle Quiz Part 1 1) Find the Area of the parallelogram (1pt) base:67 hight:52 A)3,302 ft2 B)3,484 ft2****** C)3,752 D)4,020 2)Find the Area of the triangle (1pt) base:2.8cm hight:7.8cm A)21.84 cm2

  4. Calculus

    A piece of wire 40cm long is cut into two pieces. One piece is bent into the shape of a square and the other is bent into the shape of a circle. How should the wire be cut so that the total area enclosed is a) a maximum? /b) a

  1. MATH

    Find the circumference for the circle ( use 3.14 for pi ). Round to the nearest tenth. the circumference for the circle is 23 yd.

  2. 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.

  3. math 5th

    Estimate the area of the circle and use 22/7 for pie. Teh circle shows line all the way accross measruing 28cm. Find area. Can some one explain how

  4. Calculus

    Find the rate of change of the circumference of a circle with respect to the area when the area is 4π square feet.

  1. Math

    What is the circumference of the circle? Round your answer to the nearest tenth. The radius of the circle is 12.5 cm. A) 39.25 cm B) 392.5 cm C) 78.5 cm** D)785 cm If I'm right, I guess I did it right, if I'm not, please tell me

  2. Geometry

    A circle with a radius of 1/2 ft is dilated by a scale factor of 8. Which statements about the new circle are true? Check all that apply. A.The length of the new radius will be 4 feet. B.The length of the new radius will be 32

  3. math

    What is the area of a circle if the circumference is 87.92 cm^2?

  4. Math 7 - NYS Math Exam Review Help!

    19. The circumference of the circle below is 25.12 centimeters ***** There is a circle and then there is a line and written radius C = 2(pi)r Which is the best estimate for the length of the radius of the circle? a) 3 cm b) 4 cm

You can view more similar questions or ask a new question.