Examine whether AB and CD are parallel in each of the following cases. Write
proper reason.
(i) b = 80°, 2y = 80°
(ii) b = 70°, LZ = 70°
(iii)La = 40°, 2y = 40° (iv) b = 100°, 2x = 80°
(v) Lc = 65°, 2X = 65°
(vi) La = 42°, 2X = 42°
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