Area, of the rectangle = 50 × 20 = 1000 cm2
If the two semicircles cut out are joined it becomes a circle
Its radius = 20/2 = 10 cm
Area of the portion cut out
= πr2 = π × 10 × 10 = 3.14 × 10 × 10 = 314 cm2
Area of the remaining portion
= 1000 – 314 = 686 cm2
