February 28, 2017

Homework Help: PreAlgebra

Posted by y912f on Friday, May 8, 2009 at 5:05pm.

A circular pond 20 m in diameter is surrounded by a gravel path 5 m wide. The path is to be replaced by a brick walk costing $30 per square meter. How much will the walk cost?

i need to teach this to my brother, but i'm stuck on it myself. please show me how this would be solved
i tried figuring out the area of the whole circle(including the pond and walk) and then subtracting the inner circle (pond)
but i don't get the correct answer

please help

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