12. In the given figures below, decide whether I is parallel to m.
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L and M are parallel in figure 3
They are not parallel in figure 1,2 and 4.
From properties of transversal, sum of given angles of a figure must be 180 degrees, due to their position in the transversal.
Their sum is 180 in fig. 3
sum is not 180 in fig. 1, 2 & 4
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