- x - ABCD is a parallelogram- - mathrm - M - - is the mid point of - mathrm - BD - - and - mathrm - BM - - bisects - angle mathrm - B - - - Then- - angle - AMB equals- -A- - 45 - - circ - - B- - 60 - - circ - - ter - 90 - - circ - - D- None

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\( x \) ABCD is a parallelogram, \( \mathrm { M } \) is the mid point of \( \mathrm { BD } \) and \( \mathrm { BM } \) bisects \( \angle \mathrm { B } \) . Then, \( \angle \) AMB equals. (A) \( 45 ^ { \circ } \) B) \( 60 ^ { \circ } \) ter \( 90 ^ { \circ } \) D) None