A) \[{{40}^{{}^\circ }}\]
B) \[{{50}^{{}^\circ }}\]
C) \[{{80}^{{}^\circ }}\]
D) \[{{100}^{{}^\circ }}\]
Correct Answer: B
Solution :
(b): Sum of the angles of quadrilateral is\[{{360}^{{}^\circ }}\], \[\therefore \]\[\angle A+\angle B+{{30}^{{}^\circ }}+{{70}^{{}^\circ }}={{360}^{{}^\circ }}\] \[\therefore \]\[\angle A+\angle B={{260}^{{}^\circ }}\] \[\Rightarrow \]\[\frac{1}{2}\angle A+\frac{1}{2}\angle B={{130}^{{}^\circ }}\]You need to login to perform this action.
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