I need help with this attached question from my SAT question. Please help me.

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- Oct 2nd 2010, 07:22 AM #1

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- Oct 2nd 2010, 07:41 AM #2

- Oct 2nd 2010, 07:42 AM #3
sketch a y-axis that cuts the large circle vertically thru its center, then take the lower large semicircle and reflect it (flip it) over the y-axis

can you see that the unshaded area = $\displaystyle \pi \cdot 2^2 - \pi \cdot 1^2$ ?

shaded area = area of large circle - unshaded area