in solving this, we will be using tha area of sector formular,
area of a sector = theta/360 X pi r^2
r = WP/2
recall that WP = 36
so,
r = 36/2
r = 18cm
theta of the shaded area,
theta = 180 - 50
theta = 130
so,
area of the shaded area = 130/360 X 3.14 X 18^2
Area = 13 X 324/36
Area = 13 X 9
Area = 117 pi Cm^2
this makes the first otions correct.
