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20 August, 18:48

What's is the radius of a circle with a area of 3.21 square feet

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  1. 20 August, 19:47
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    approx 1 foot

    The area (A) of a circle = πr² (where r is the radius)

    thus r² = A/π ⇒ r = √ (A/π = √ (3.21/π) = 1.0108 ... ≈ 1 foot (to 1 dec. place)
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