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January 31, 2015

Posted by **gracie** on Wednesday, March 17, 2010 at 4:47pm.

- 5th grade -
**LoveMaths**, Wednesday, March 17, 2010 at 4:53pmFormula for area of a circle is πr^2

Formula for circumference is 2πr or πD where D is diameter which is double the radius.

Now, try do the math...I will be glad to check your work.

- 5th grade -
**Damon**, Wednesday, March 17, 2010 at 4:54pmarea = pi r^2

circumference = 2 pi r

pi is about 3.14159

- 5th grade -
**Ms. Sue**, Wednesday, March 17, 2010 at 4:54pmArea = pi * r^2

A = 3.14 * 36

A = ?

C = pi * d

C = 3.14 * 12

C = ?

- 5th grade -
**LoveMaths**, Wednesday, March 17, 2010 at 4:58pmLet me give a similar example...the radius of a circle is 5cm. What is the area and circumference.

Area = πr^2 = π5^2 = 25π.

Circumference = 2 x π x 5 = 10π

The value for π is 3.142 but since this is a 5th grade math sum, i doubt they'll want you to calculate using the value of π.

Now, try the sum u were given and see if you get the correct answer. I will be glad to help you through.

- 5th grade -
**Jake**, Friday, March 19, 2010 at 2:51pm37.68

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