Question

ek vritakar Saman chaurai wale raste ki bahari ghera 20π metre tatha bhitri ghera 18π metre hai to raste ki chaurai gyat kare​

Answer 1

Given:

A road is in the shape of a circle whose outer and inner circumference is 20π meter and 18π meter respectively.

To find:

The width of the road

Solution:

Let "R" be the outer radius of the road and "r" be the inner radius of the road.

Circumference of the outer circle = 20π

∴ $2 \pi R = 20 \pi$

$\implies 2R = 20$

$\implies \bold{R = 10\:m}$ ← outer radius

Circumference of the inner circle = 18π

∴ $2 \pi r = 18 \pi$

$\implies 2r =18$

$\implies \bold{r = 9\:m}$ ← inner radius

Therefore,

The width of the road  = R - r = 10 - 9 = 1 m

Thus, the width of the circular-shaped road is → 1 m.

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