1.

3d + 50°2d +20°ーm(A) 22 (B) 30 (C) 45° (D) 80°

Answer»

line l and line m are parallel3d+50°+2d+20°=180° ------------(by interior angle test)

3d+2d+50+20=1805d+70=1805d=180-705d=110d=110/5d=22



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