Posted by **Cindy** on Wednesday, February 12, 2014 at 4:39pm.

Find the area of a circle with the given radius or diameter. Round your answer to the nearest tenth.

Diameter = 42.0 mm

- MATH -
**Ms. Sue**, Wednesday, February 12, 2014 at 4:45pm
A = pi * r^2

A = 3.14 * 21^2

A = 1,384.7 sq. mm

- MATH -
**Damon**, Wednesday, February 12, 2014 at 4:45pm
radius = 42.0/2 = 21.0

A = pi r^2

= 3.14159 * 21 * 21

round answer to nearest tenth

- MATH -
**Cindy~Never Mind!**, Wednesday, February 12, 2014 at 4:46pm
Never Mind!

Don't Answer this question!

- MATH -
**Damon**, Wednesday, February 12, 2014 at 4:46pm
to square 21:

(20+1)(20+1) = 400 + 40 + 1 = 441

- MATH -
**Damon**, Wednesday, February 12, 2014 at 4:47pm
Oh well :(

- MATH -
**Cindy~Never Mind!**, Wednesday, February 12, 2014 at 4:47pm
OK, Thanks!

Ms. Sue and Damon!

But I already got the answer!

It was 1,384.7

- MATH -
**Cindy~Never Mind!**, Wednesday, February 12, 2014 at 4:48pm
You guys are very kind! :)

- MATH -
**Damon**, Wednesday, February 12, 2014 at 5:00pm
You are welcome :)

be sure you want mm^2, usually that would be converted to cm^2 or m^2

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