A) \[{{70}^{{}^\circ }}\]
B) \[{{90}^{{}^\circ }}\]
C) \[{{60}^{{}^\circ }}\]
D) \[{{80}^{{}^\circ }}\]
Correct Answer: C
Solution :
(c): The angle subtended at the centre by an arc is twice to that of angle subtended at the circumference. \[\therefore \]\[\angle CAD=\frac{1}{2}\angle COD={{60}^{{}^\circ }}\] \[\therefore \angle BAD={{60}^{{}^\circ }}+{{60}^{{}^\circ }}={{120}^{{}^\circ }}\] \[\therefore \] \[\angle BCD={{180}^{{}^\circ }}-{{120}^{{}^\circ }}={{60}^{{}^\circ }}\]You need to login to perform this action.
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