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A coin is a circle with diameter of 18 mm. What is the exact area of the coin?

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Answer:

Explanation:

The area of a circle can be found by multiplying pi ( π = 3.14) by the square of the radius. If a circle has a radius of 4, its area is 3.14*4*4=50.24. If you know the diameter, the radius is 1/2 as large.

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