Maths-

General

Easy

Question

# Find the area of circular ring whose external and internal radii are 10cm and 3 cm respectively

Hint:

### Area of circular ring is the difference of the areas bof two circles

## The correct answer is: 286 cm2

### It is given that External radii, r_{1} = 10 cm

Internal radii, r_{2} = 3 cm

Area of circular ring = Area of outer ring – Area of inner ring

= (r_{1})^{2} - r^{2 }

= × (r_{1})^{2} - × (r_{2})^{2}

= × (10^{2} – 3^{2})

= × 91 = 286 cm^{2}

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