SOLUTION: find the area of a circular ring formed by the circumference of two concentric circles of raddii 11m and 4 m. also find the cast of painting this ring at the rate of Rs. 21 per m s

Question 1070878: find the area of a circular ring formed by the circumference of two concentric circles of raddii 11m and 4 m. also find the cast of painting this ring at the rate of Rs. 21 per m sq.
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
The area is,

The cost would be,

Work that out for a final answer.
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