Lines and Angles
Haryana Board · Class 9 · Mathematics
Most important questions from Lines and Angles for Haryana Board Class 9 Mathematics board exam 2026. MCQs, short answer, and long answer questions with marks.
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Which of the following are properties of parallel lines? (Select all correct answers)
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They never meet, They have the same distance between them everywhere, They form equal corresponding angles with a transversal
Parallel lines never intersect, maintain constant distance between them, and when cut by a transversal, form equal corresponding angles. They don't intersect at any point and don't necessarily form right angles with each other.
When two parallel lines are cut by a transversal, corresponding angles are:
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Equal
This is the Corresponding Angles Axiom. When two parallel lines are cut by a transversal, the corresponding angles (angles in the same relative position) are always equal.
If ∠A = 60°, what is the measure of its complement?
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30°
The complement of an angle is what you need to add to make 90°. Since ∠A = 60°, its complement = 90° - 60° = 30°.
Which of the following angle pairs are always equal when two parallel lines are cut by a transversal? (Select all correct answers)
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Corresponding angles, Alternate interior angles, Alternate exterior angles
When parallel lines are cut by a transversal, corresponding angles, alternate interior angles, and alternate exterior angles are equal. Co-interior angles are supplementary (add to 180°), not equal. Adjacent angles may or may not be equal.
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