SOLUTION: the inner circumference of a circular track is 220m. The track is 7m wide everywhere. calculate the cost of putting up a fence along the outer circle at the rate of rs 2 per metre.

Algebra ->  Polygons -> SOLUTION: the inner circumference of a circular track is 220m. The track is 7m wide everywhere. calculate the cost of putting up a fence along the outer circle at the rate of rs 2 per metre.      Log On


   

Question 941900: the inner circumference of a circular track is 220m. The track is 7m wide everywhere. calculate the cost of putting up a fence along the outer circle at the rate of rs 2 per metre.
Answer by macston(5194) About Me  (Show Source):
You can put this solution on YOUR website!
circumference%28C%29=pi%282r%29
radius%28r%29=C%2F2%2Api
r=220m%2F2%2Api=35m
the width of the track adds 7m to the radius
outside radius=35m+7m=42m
outer circumference=OC
OC=pi%282r%29=pi%282%2A42m%29=pi%2884m%29=264m
264m of fence at rs 2 /meter= rs 528