Geometrymedium · Past Paper
The difference between the circumference and the radius of a circle is 37 cm. What is its radius?
A7 cm
B14 cm
C21 cm
D28 cm
✓ Correct Answer: A — 7 cm
2*pi*r - r = 37 => r(2*22/7 - 1) = 37 => r(44/7 - 1) = 37 => r(37/7) = 37 => r = 7.
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