What is the circumference of a circle with a radius of 4.2 inches? A) 13.2 in. B) 6.6 in. C) 8.4 in. D) 55.4 in. E) 26.4 in.
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Originally Posted by Leo34005 What is the circumference of a circle with a radius of 4.2 inches? A) 13.2 in. B) 6.6 in. C) 8.4 in. D) 55.4 in. E) 26.4 in. Please show your attempt and state where you get stuck. NB: I would appreciate that no other replies be given until the OP has done what I asked.
C = 2πr Since the radius = 4.2 inches, r = 4.2. So we have: C = 2π(4.2) ==> C = 8.4π ==> C ≈ 26.39 in^2 Therefore, the answer is E
Originally Posted by Leo34005 C = 2πr Since the radius = 4.2 inches, r = 4.2. So we have: C = 2π(4.2) ==> C = 8.4π ==> C ≈ 26.39 in^2 Therefore, the answer is E Correct (except the unit is inches, not square inches).
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