Homework Help: Math question

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

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