Find the area of a circle with the given radius or diameter. Round your answer to the nearest tenth.
Diameter = 42.0 mm
1.B,C
2.C
3.C
4.B
5.D
6.A
7.A
8.C
A = pi * r^2
A = 3.14 * 21^2
A = 1,384.7 sq. mm
radius = 42.0/2 = 21.0
A = pi r^2
= 3.14159 * 21 * 21
round answer to nearest tenth
Never Mind!
Don't Answer this question!
to square 21:
(20+1)(20+1) = 400 + 40 + 1 = 441
Oh well :(
OK, Thanks!
Ms. Sue and Damon!
But I already got the answer!
It was 1,384.7
You guys are very kind! :)
You are welcome :)
be sure you want mm^2, usually that would be converted to cm^2 or m^2