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The diagram shows three parallel lines and another line that crosses the parallel lines Find the angles marked a, b, c and d

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The two parallel lines LM and NP are intersected by the line RS The arrows pointing to the same direction indicate that the lines are parallel (i) The corresponding angles are equal a = e b = f c = g d = h (ii) The alternate angles are equal c = e d = f (iii) The sum of two allied angles is 180o c + f = 180o d + e = 180o

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