a paper is in a square form whose one side is 20 cm . two semi circles are drawn on its opposites as diameters . if these semi circles are cut down what is the area of the remaining paper ?
( 5 * 3.5 ) / 2 = 8.75 answer : c
divide(subtract(square_area(20), circle_area(divide(20, const_2))), const_10)