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4 September, 06:04

The diameter of a circle is 18 cm what is its area in terms of pi

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  1. 4 September, 08:47
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    A = 81π cm²

    Step-by-step explanation:

    The formula for area of a circle is A = πr², where r is the radius. The radius is half the diameter, so our radius for this problem is

    18/2 = 9. So the area is ...

    A = π (9²) = π (81)

    A = 81π cm²
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