Question

Inner and outer radii of an annulus of circle are 10 cm and 4 cm .Find the area of annulus

Answer 1

$\pi \times 10 {}^{2} - \pi \times 4 {}^{2}$

$100\pi - 16\pi$

$84\pi$

Answer 2

The area of annulus is 263.76 sq.cm.

Step-by-step explanation:

Inner radii = 4 cm

Outer radii = 10 cm

Inner area =$\pi r^2 = 3.14 \times (4)^2 =50.24 cm^2$

Outer area = $\pi R^2 = 3.14 \times 10^2 = 314 cm^2$

Area of annulus = Outer area - Inner area = $314 - 50.24 = 263.76 cm^2$

Hence the area of annulus is 263.76 sq.cm.

#Learn more:

Find the area of annulus whose inner and outer radii are 6cm and 8cm

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