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Niusha
13) BCA = 90*
CAB = tan^-1 (10/13)
= 37.57*
ABC = tan^-1 (13/10)
= 52.43*

14) ACB = 90*
CBA = tan^-1 (2/3)
= 33.69*
BAC = tan^-1 (3/2)
= 56.31*
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