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Problem 12 - Entrance Test

A square and a circle have the same perimeter. If the square’s side is 11 cm, what is the radius of the circle (in cm, to one decimal)?

Correct: B

Perimeter square = 4·11 = 44 cm → circumference circle = 44 = 2πr → r = 44/(2π) ≈ 7.0 cm.