Asemi circle sits on top a rectangle to form the figure below finds its area and perimeter use 3.14 for pie

Area of a circle = (3.14) * r^2
radius = diameter/2
radius = 4/2
r = 2

A = (3.14) * 2^2
A = (3.14) * 4
A = 12.57
since it's a half circle though, 12.57/2 = 6.29

the area of the rectangle is bh, 4*2 = 8

6.29 + 8 = 14.28
area = 14.28

perimeter of a circle, or circumference = 2(3.14)r
C = 2(3.14) * 2
C = 6.28 * 2
C = 12.57
but again, since it's a half circle, 12.57/2 = 6.29

perimeter of a rectangle = 2(l + w)
p = 2(4 + 2)
p = 2(6)
p = 12
but because the perimeter is what's on the outside, we don't count the side connecting to the circle, so it'd be 12 - 4 = 8

6.29 + 8 = 14.28
perimeter = 14.28

your answer is D