Question Number 10166 by Joel575 last updated on 28/Jan/17

Commented byJoel575 last updated on 28/Jan/17

Two circles with same center point have  R_1  and R_2  with R_1  < R_2   If the long of AB bowstring is 10 cm,  count the area of blue shade

Answered by mrW1 last updated on 28/Jan/17

A_(blue) =π(R_2 ^2 −R_1 ^2 )=π×((L/2))^2 =π(((10)/2))^2 =25π