Question

Find The area of ring whose outer and inner radii are 20 cm and 15 cm

Answer 1

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Here's your answer

Area of ring = Area of outer circle - Area of inner circle

Radius of outer circle = 20cm

Radius of inner circle = 15cm

Area of outer circle = πr² = 3.14×20² = 1256cm²

Area of inner circle = πr² = 3.14×15² = 706.5cm²

Hence

Area of ring = 1256 - 706.5

                     = 549.5cm²

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Answer 2

Answer:

Area of ring=550cm^2

Step-by-step explanation:

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