A) 40
B) 50
C) 60
D) 70
Correct Answer: A
Solution :
If, BM and CN are perpendicular, Then, \[\angle ABM=90{}^\circ \]and \[\angle DCN=90{}^\circ \] Now, \[\angle MBE=120{}^\circ -90{}^\circ =30{}^\circ \] And \[\angle ECN=100-90{}^\circ =10{}^\circ \] So, \[\angle BEO=\angle MBE=30{}^\circ \] And \[\angle CEO=\angle ECN=10{}^\circ \] Hence, \[\angle BEC=x{}^\circ =30{}^\circ +10{}^\circ =40{}^\circ \]You need to login to perform this action.
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