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In the given figure, $PA$ is a tangent from an external point $P$ to a circle with centre $O$. If $\angle POB = 125^\circ$, then $\angle APO$ is equal to :
- (a)$25^\circ$
- (b)$65^\circ$
- (c)$90^\circ$
- (d)$35^\circ$
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(d) $35^\circ$ (1 Mark)