Question

FAN + MEDAL

The diameter of the larger circle is 10.5 cm. The diameter of the smaller circle is 4.5 cm. What is the approximate area of the shaded region?
http://lv.k12.com/mediaFiles/Ninth_Grade/Math/Unit17525/Lesson68695/VHS_PA_S2_03_L312_LQ_Q4.gif


A.
70.7 square centimeters

B.
86.5 square centimeters

C.
102.4 square centimeters

D.
282.6 square centimeters

Answer 1

From the big circle area, the small circle area is removed (i.e., subtracted)
Area of circle $=\pi r^2$

Answer 2

Thanks @electrokid :)