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Find the area of a circle from its radius or diameter

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Question 1

A circle has a radius of 21 cm. Taking π = 227, what is its area?

A circle has a radius of 21 cm. Taking π = 22/7, what is its area?
Question 2

A circle has a diameter of 60 cm. Taking π = 3.14, what is its area?

A circle has a diameter of 60 cm. Taking π = 3.14, what is its area?
Question 3

A circle has a diameter of 168 cm. Taking π = 227, what is its area?

A circle has a diameter of 168 cm. Taking π = 22/7, what is its area?

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