Question

a circular park of radius 20m has a 5m wide road running around it. Find the cost of metalling the road at the rate of 18.90 per sq m​

Answer 1

hope this picture help u..

Answer 2

Step-by-step explanation:

Let ankur will represented as A , Syed as S and David as D.

The boys are sitting at equal distance.

Hence, Triangle ASD is equilateral triangle.

let the radius of circular part be r meters

OS = r = 20 m

let length of each side after angle ASD be x meters.

Draw AB parallel SD

$SB = BD = \frac{1}{2} SD \frac{x}{2} m$

In Triangle ABS,<B = 90°

$By the Pythagoras theorem ⇒$