Posted by Anne on Tuesday, December 7, 2010 at 9:20pm.
I don't understand how to find the aproximate area of a shaded region
This problem has a big cirlce with 1/4 shadded with a radius of 20 cm.
the answer chocies are
A. 90 cm squared
B. 270 cm squared
C. 314 cm squared
D. 1.256 cm squared
how do I find the answer?

Math question  Bob, Tuesday, December 7, 2010 at 9:27pm
pi*r^2
3.14*20cm.^2
=1256.63
take that and divide by four and you get 314.16 
Math question  Danny, Tuesday, December 7, 2010 at 9:34pm
I don't understand how you got 1256.63

Math question  Anna, Tuesday, December 7, 2010 at 9:37pm
I don't either I got 62.8