A) \[145{}^\circ \]
B) \[125{}^\circ \]
C) \[100{}^\circ \]
D) \[140{}^\circ \]
Correct Answer: B
Solution :
(b): 'a' = exterior \[\angle le=\angle ABC+\angle ACB=90{}^\circ +\angle ACB\] \[\angle ACB=180{}^\circ -145{}^\circ =35{}^\circ \] \[\therefore \,\,\,a=90+35{}^\circ \] \[=125{}^\circ \]You need to login to perform this action.
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