Cut a rectangular paperboard 12 cm long and 8 cm wide into the largest semicircle. What is the area of the remaining paperboard after cutting it?

Cut a rectangular paperboard 12 cm long and 8 cm wide into the largest semicircle. What is the area of the remaining paperboard after cutting it?


As the title, the diameter of the semicircle = the length of the rectangle = 12 cm
Semicircle area = 3.14 × (12 △ 2) & # 178; △ 2 = 56.52 (cm2)
Rectangle area = 12 × 8 = 96 (square centimeter)
After cutting, the remaining paperboard area = 96-56.52 = 39.48 (cm2)