A circular ground whose radius is 15 metres, has a 1.2 metre-broad garden around it. What is the area of the garden in square metres?	Choose the correct answer:
A) 118.67  B) 116.67  C) 117.67  D) 120.56  E) 120.57

Rationale: req . area = ï € [ ( 16.2 ) 2 â € “ ( 15 ) 2 ] = 22 â  „ 7 ã — ( 31.2 ã — 1.2 ) [ since a 2 - b 2 = ( a + b ) ( a - b ) ] = ( 22 ã — 31.2 ã — 1.2 ) / 7 = 117.67 sq m answer c
Answer: C