A horse is tethered to one corner of a rectangular grassy field 36 m by 20 m with a rope 12 m long. Over how much area of the field can it graze?	Pick one:
A) 154 cm 2	B) 113 m 2	C) 123 m 2	D) 115 m 2	E) none of these

Rationale: "area of the shaded portion = 1 ⁄ 4 × π × ( 12 ) 2 = 113 m 2 answer b"
Answer: B