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2 February, 21:51

Two circles are shown in the diagram. Since all circles are similar, a proportion can be set up using the circumference and diameter of each circle. Substitute the values d1 = 1, C1 = π, and d2 = 2r into the proportion. Which shows how to correctly solve for C2, the circumference of any circle with radius r? Because Because Because Because

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  1. 3 February, 00:16
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    [A] Because pi/1 = c₂/2r, c₂ = 2r/pi
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