Thursday

September 18, 2014

September 18, 2014

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

**Answer this Question**

**Related Questions**

Geometry - A circle with a radius of 1/2 ft is dilated by a scale factor of 8. ...

Circumference - Find the circumference and area of cirlce with a radius of 3 ...

Algebra - The Circumference and area of a circle of radius r are givin by 2 [pie...

math - Okay. So i'm doing this project for my geometry class about different ...

5th grade math - The diameter of a penny is 3/4 in. How many pennies are needed...

math - the radius of a circle when the numeric values of the circumference and ...

Math - The area of a rectangle is shown below The area of the rectangle is 56 ...

Computer Science (Basics) - public class Circumference { /** * @param args */ ...

Circumference and Area of Circles - can someone help me with these:Find the ...

5th grade - what is the circumference of a circle that has a diameter of 8 m