Find the area of the shade region Use pi almostequalto 314 a

Find the area of the shade region. Use pi almostequalto 3.14 and approximate to two decimal places. Which has the largest volume, a sphere with radius 9 cm, a right circular cylinder with radius 8 cm and height 12 cm. or a right circular cone with radius 12 cm and height 15 cm? Calculate all three values. Use pi almostequalto 3.14.

Area of shaded area
= Areaofsemicircle - areaoftriangle
= 1/2 * pi *20^2 - 1/2 *40*20
=200*3.14-400
=228