The figure below is a graphic drawn with semicircles with radii 2 cm and 4 cm.
Find the area of the portion of the shadow.
Pi is assumed to be 3.14.
Solution
4 × (2 + 8) - 2 × 2 + 4 × 4 × 3.14 × 1/2 + 4 × 4 × 3.14 × 1/4 - 2 × 2 × 3.14 × 1/2
= 40 - 4 + (8 + 2) × 3.14 = 36 + 31.4 =67.4 cm2
