Semi circle can be added together to become a circle
Area of circle: pi * r^2
r = half diameter = 4/2 = 2
pi * 2^2 = 12.566 cm^2
Rectangle: L * W
4 * 6 = 24 cm^2 for rectangle
Add both areas
12.566 + 24 = 36.566
Solution: 36.57 cm^2
(I don’t know if you need to round)