1.

Observe the given figure. If \[\angle \text{b=62 }\!\!{}^\circ\!\!\text{ }\] and \[\angle \text{c=77 }\!\!{}^\circ\!\!\text{ }\], find \[\angle \text{a}\].

A.  \[\text{39 }\!\!{}^\circ\!\!\text{ }\]                       
B.  \[\text{141 }\!\!{}^\circ\!\!\text{ }\]                     
C.         \[\text{41 }\!\!{}^\circ\!\!\text{ }\]                       
D.         \[\text{139 }\!\!{}^\circ\!\!\text{ }\]
Answer» D.         \[\text{139 }\!\!{}^\circ\!\!\text{ }\]


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