the inner circumference of a circular track is 220 m The track is 7 m wide everywhere Calculate - Maths - Mensuration

Question

the inner circumference of a circular track is 220 m The
track is 7 m wide everywhere Calculate the cost of putting fence
along the outer circle at Rs 2 per metre

Yashit Maheshwary · Answer

radius of the inner circle = x
220=2<img src=
"http://www%20mathgoodies%20com/lessons/vol2/images/pi%20gif"
border="0" alt="Pi" width="12" height="10">x
220=2*22/7*x
220*7 = 44x
1540= 44x
x=1540/44
=35m
35m is theradius of the inner circle so the radius of the outer
circle will be 35+7=42m
Cost of fencing the outer circle = {circumference of the outer
circle* 2}
(2*22/7*42}*2
{44*6}*2
264*2
528RS

the inner circumference of a circular track is 220 m. The track is 7 m wide everywhere. Calculate the cost of putting fence along the outer circle at Rs.2 per metre.