Question

the diameter of a circular path is 140 m .around it on the outside ,a path having the width of 7 M is constructed if the path has to be fenced from inside and outside at rupees 7 per metre find its total cost.

Answer 1

diameter of inside circle is 140 circumference is22/7×140,440m
outside path is7m and radius of inside circle is70 so the radius of outside circle is77 so circumference of outside circle is 2×22/7×77,2×22×11,11×44,484 m
circumference of both circle is 484+440,924m
cost of 1m is 7rupeescost
so cost of 924 is924×7=6468rupees .