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Question

In the figure ,BAD=3DBA ,find ABC (in degrees)
703511_21dc34bb74f0492e9e32cb50be9e243f.png

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Solution

BAD=3DBA
in $\triangle ABD$
DAB+ABD+ADB=180
DBA+104=180
DBA=4526
=19
BAD=3×19=57
in ABC
BAD+ABC+ACB=180
ABC=1806557
=58o

1310429_703511_ans_4d3cd09296614f7b8c0fd63cf0b973f4.png

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