Question

A circular garden with radius 42 m is surrounded from outside by a path of 3.5 m wide. Find the cost to pave the stones on the path at the rate of Rs. 20 per m2.

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Answer 1

$\huge\color{blue}\boxed{\colorbox{lightgreen}{♧Solurion♧}}\bigstar$

Internal Radius = 21 m, External Radius =21+3.5=24.5 m

$Area of path = π(24.5)^2-π(21)^2$

$⇒π[(24.5)^2 −(21) ^2 ]$

=500.5

Cost of travelling =500.5×4=Rs.2002