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| Transversal |
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| A transversal is a line that intersects two or more lines at distinct points. In the figure given below, XY is a transversal. |
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| (i) The four pairs of angles 1 and 5, 2 and 6, 4 and 7, 3 and 8 are called corresponding angles (the corresponding angles are similarly situated) |
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| (ii) The two pairs of angles 2 and 8, 4 and 5 are called alternate angles (alternate angles occur in Z formation). |
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| (iii) The two pairs 2 and 5, 4 and 8 are called pairs of interior angles on the same side of the transversal. |
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