The diameter of a circular glass lens is 8.7 centimeters. Paige uses the edge of the lens to trace a circle on a sheet of paper. What is the estimated circumference of the circle?
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radius = d/2 = 8.7/2 =4.35 cm
Circumference, = 2 pi r = 2 ×3.14 × 4.35 = 27.331cm
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