The radius of a circle is 15.84 cm shorter than its circumference. What is the diameter of the circle?

Analysis: assuming that the radius is RCM, the perimeter is 3.14 × 2 × R
Then the radius is shorter than the perimeter: 6.28r-r = 5.28r
So:
The radius is 15.84 (3.14 × 2-1) = 3cm
The diameter is 3 × 2 = 6cm

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