Question

The radius of circular garden is $7m$ what would it cost to put a $4$ round fence around this garden at a rate of $40$ rupees per meter ?

Answer 1

Given the radius of the circular garden is $7$ cm.

Then its perimeter is $2\times \frac{22}{7}\times 7=44$ cm.

Now cost to put a $4$ round fence around this garden at a rate of

$40$ rupees per meter $=4\times 44\times 40=7040$ rupees.