Angles subtended by equal chords at the centre of the circle are .
A
supplementary
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B
equal
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C
complementary
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Solution
The correct option is B equal Consider the above diagram of a circle with centre O. PQ and RS are equal chords of the circle. The angle subtended by chord PQ at the center of circle is ∠POQ. The angle subtended by chord RS at the center of circle is ∠ROS. In △s POQ and ROS, we have PQ = RS (Given) OP = OR (Radii of the same circle), and OQ = OS. Thus, by SSS congruency criterion, △POQ=△ROS. By C.P.C.T., ∠POQ=∠ROS.