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Work and correct = brainlist

13.
<3 = 180 - <1
<3 = 180 - 90
<3 = 90°
14.
<8 = 180 - <6
<8 = 180 - 137
<8 = 43°
15.
<4 = 180 - <2
<4 = 180 - 34
<4 = 146°