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In the given figure, PA is tangent to a circle with centre O. If $\angle APO = 30^\circ$ and $OA = 2.5 \text{ cm}$, then OP is equal to
- (a)$2.5 \text{ cm}$
- (b)$5 \text{ cm}$
- (c)$\frac{5}{\sqrt{3}} \text{ cm}$
- (d)$2 \text{ cm}$
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Ans: (B) $5 \text{ cm}$