Question

the diameter of a circular Park is 13 A road of 2 metres wide runs around it find the cost of gravelling the road at rupees 5 per metre square

Answer 1

Answer:

Let the diameter of the

circular park ( D ) = 13 m

Radius of the park ( R ) = D/2

R = 13 /2 =6.5

If the width of the path inside the

park ( w ) = 2m

Radius of the inside circle (r ) = R - w

r = 6.5 -2 = 4.5 m

Area of the path ( A ) = πR² - πr²

A = π(R + r ) (R - r )

= π ( R + r ) w

= ( 22 /7 ) ( 6.5 + 4.5 ) ( 2 )

= 22 * 5.56 *2

A = 244.64(approx)

Cost of the paving the per square

meter = Rs 5

Cost of paving total area of the path

=5*244.64

= Rs1224.8

I hope this helps you.

:)