a horse is tethered to one corner of a rectangular grassy field 45 m by 25 m with a rope 22 m long . over how much area of the field can it graze ?
"area of the shaded portion = 1 ⁄ 4 × π × ( 22 ) 2 = 380 m 2 answer b"
divide(multiply(power(22, const_2), const_pi), const_4)