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?  Choose the correct choice.
A) 154 cm2	B) 113 m2	C) 123 m2	D) 115 m2	E) None of these
Area of the shaded portion   = 1⁄4 × π × (12)2 = 113 m2   Answer 113 m2
<result>B</result>
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?