lillianesagoff1629 lillianesagoff1629

24-09-2018
Mathematics

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

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jimrgrant1 jimrgrant1

24-09-2018

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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