A circle with radius of 9 cm sits inside iſ circle with radius of 11 cm. What is the area of the shaded region?
Round your final answer to the nearest hundredth

Which sum or difference identity would you use to verify that cos (180° - q) = -cos q? a.) sin (a -b) = sin a cos b – cos a sin b b.) cos (a -b) = cos a cos b – sin a sin b c.) cos (a -b) = cos a cosb + sin a sin b d.) sin (a + b) = sin a cos b + cos a sin b