calculate the area of a circular ring, whose internal and external radii are 3cm and 10 cm respectively
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answer
286 cm square
explanations
let external radius R = 10 cm
internal radius r = 3 cm
now
area of a circular ring = area of circle with radius R - area of circle with radius r
=22/7 (10 square) -22/7 (3 square) cm square
=22/7 (100-9) cm square
=22/6 (91) cm square
=22×13 cm square
=286 cm square
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