A) \[{{42}^{{}^\circ }}\]
B) \[{{45}^{{}^\circ }}\]
C) \[{{48}^{{}^\circ }}\]
D) \[{{58}^{{}^\circ }}\]
Correct Answer: A
Solution :
(a) \[\therefore \]\[\angle ADC={{90}^{{}^\circ }}\] (Angle in semi-circle is a right angle) \[\angle ADB=\angle ADC-\angle BDC={{90}^{{}^\circ }}-{{48}^{{}^\circ }}={{42}^{{}^\circ }}\] \[\angle ADB=\angle ACB={{42}^{{}^\circ }}\] (Angle in a same segment in a right angle)You need to login to perform this action.
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