Explanation:
< 2 = 37 = <4 (vertically opposite angles)
<3 = 180-37 = 144
<1 = 144
<2 = <8 = 37 ( alternate angles)
<3 = <5 = 144 (alternate angles)
<8 = <6 = 37 (vertically opposite angles)
<5 = <7 = 144 (alternate angles)
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