Question

The area sector AOB is 20.25π ft squared. Find the exact area of the shaded region.

Answer 1

Check the picture below.

so the triangle has a height of 9 and a base of 9, since it's the radius anyway.

if we subtract the area of that triangle from the area of the circle's sector, what's leftover is just the shaded area.

20.25π - 40.5.