A circular ground whose diameter is 40 metres, has a garden of area 1100m^2around it. What is the wide of the path of the garden ?
Choices:
A) 8.07
B) 7.07
C) 6.07
D) 7.0
E) 8.5
Req. area = Ï€[(20)2 â€“ (r)2]   = 22â„7 Ã— (400- r^2)[since a2 - b2 = (a + b)(a - b)]   ie)22/7(400-r^2)=1100 , ie) r^2=50, r=7.07m   Answer 7.07
<result>B</result>
A circular ground whose diameter is 40 metres, has a garden of area 1100m^2around it. What is the wide of the path of the garden ?