If  I, m, n are three parallel lines and the transversals  t1 and  t2 cut the lines I,  m, n at the points  A, B, C and  P, Q,  R as shown in the figure, thenSelect answersABCD

Line m passes through the points (3, 7) and (6, 12) while line n passes through the points (-5, 1) and (-2, 6).Which statement accurately describes the relationship between the two lines?A.Lines m and n have the same slope so they are parallel.B.Lines m and n have opposite reciprocal slopes so they are perpendicular.C.Lines m and n have the same slope so they are perpendicular.D.Lines m and n have opposite reciprocal slopes so they are parallel.

If two lines are cut by a transversal so that a pair of corresponding angles are congruent, then the lines are parallel.

There is a set of m parallel lines intersecting a set of another n parallel lines in a plane. The number of parallelograms formed, is m−1C2. n−1C2 mC2. nC2 m−1C2. nC2 mC2. n−1C2

How can you determine whether the lines are parallel, without extending these lines? Explain your reasoning.

Two lines orthogonal to a third line are parallel?