A triangle is placed in a semicircle with a radius of 9 cm

Find the area of the shaded region. Use the value 3.14 for π

, and do not round your answer. Be sure to include the correct unit in your answer.

Considering that the shaded area is the part of the semi circle outside the triangle:

Area of circle = Pi x radius2 (this means radius squared)

Area of triangle = 1/2 x base x height

1/2 (because it is a semi circle) x 3.14 (in replacement of pi as directed by question) x 9squared = 127.17

127.17 - (1/2 x 18 x 9) = 46.17cmsquared