Area of an annulus

How to calculate the area of an annulus, with example

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Area of an annulus or pipe

How to find the area of an annulus

The area = π x (Outer Radius 2  Inner radius 2)

Example:
π = 3.14
Outer Radius = 10 cm
Inner radius = 8 cm

Area =  3.14 x (102  82)
ANSWER : 113 cm2
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