A) \[{{11}^{{}^\circ }}\]
B) \[{{5}^{{}^\circ }}\]
C) \[{{12}^{{}^\circ }}\]
D) \[{{9}^{{}^\circ }}\]
Correct Answer: B
Solution :
(b): \[\angle B+C={{60}^{{}^\circ }}+{{50}^{{}^\circ }}={{110}^{{}^\circ }}\] \[\therefore \]\[\angle A={{180}^{{}^\circ }}-{{110}^{{}^\circ }}={{70}^{{}^\circ }}\] \[\therefore \]\[\angle BAD={{35}^{{}^\circ }}\] In \[\Delta ABE.\] \[\angle AEB={{90}^{{}^\circ }}\] \[\therefore \] \[\angle BAE-{{180}^{{}^\circ }}-{{90}^{{}^\circ }}-{{60}^{{}^\circ }}-{{30}^{{}^\circ }}\] \[\therefore \]\[\angle EAD=\angle BAD-\angle BAE\] \[={{35}^{{}^\circ }}-{{30}^{{}^\circ }}={{5}^{{}^\circ }}\]You need to login to perform this action.
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