Answer:
Area = 25.12 square units.
Perimeter = 20.56 units
Step-by-step explanation:
If you are looking for area, here goes:
Area of circle = π * r^2
Area of semi-circle = S = (1/2) *π * r^2
S = (1/2)*π*(4^2) = (1/2)π*16 = 8π square units = 25.12 square units
Or if you are looking for the perimeter:
Circumference C = 2*π*r
Half-circumference = (1/2)C = (1/2)*2*π*r = π*r = π*4
Perimeter of semi-circle = 4 + 4 + 4π = 8 + 4π
