1.

In figure PQ is a chord of the circle and POR is its diameter such that \[\angle PRQ=50{}^\circ \]. If PT is the tangent to the circle at the point P then \[\angle QPT\]is equal to 

A. \[45{}^\circ \]
B. \[60{}^\circ \]
C. \[50{}^\circ \]
D. \[55{}^\circ \]
Answer» D. \[55{}^\circ \]


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