test for parallel line
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Answer:
Tests for parallel lines
Step-by-step explanation:
Whether given two lines are parallel or not can be decided by examining the angles formed by a transversal of the lines.
(1)If the interior angles on the same side of a transversal are supplementary then the lines are parallel.
(2) If one of the pairs of alternate angles is congruent then the lines are parallel.
(3) If one of the pairs of corresponding angles is congruent then the lines are parallel.
9th class
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Answer:
Postulate 12: If two lines and a transversal form equal corresponding angles, then the lines are parallel. In Figure 1 , if m ∠l = m ∠2, then l // m. (Any pair of equal corresponding angles would make l // m.) ... Theorem 19: If two lines and a transversal form equal alternate interior angles, then the lines are parallel.