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Questions  >>  SAT  >>  Math  >>  Circles
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Q)

If the perimeter of a semi-circular protractor is 108 cm, find the diameter of the protractor.

$\begin{array}{1 1} (a)\; \text{42 cm} \\ (b) \; \text{21 cm} \\ (c)\; \text{$\frac{21}{2}$ cm} \\ (d) \text{none of these} \end{array}$

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