a horse is tethered to one corner of a rectangular grassy field 46 m by 20 m with a rope 17 m long . over how much area of the field can it graze ?
"area of the shaded portion = 1 ⁄ 4 × π × ( 17 ) 2 = 227 m 2 answer c"
divide(multiply(power(17, const_2), const_pi), const_4)