Q1
A line crossing two parallel lines is called a:
Atransversal
Bperpendicular
Cdiagonal
Dbisector
CBSEClass 7 (CBSE)MathematicsCh 5 · Topic 2
Intersecting Lines and Transversals
Learning about lines that cross and the angles formed by a transversal.
Core concept
When a transversal crosses two parallel lines specifically, corresponding angles are always equal, and alternate interior angles are also always equal — these relationships are extremely useful for finding unknown angles in geometric diagrams without needing to measure them directly. If a transversal crosses two lines and corresponding angles are found to be equal, this can even be used as proof that the two lines must be parallel.
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• Intersecting lines cross at exactly one point, forming angles.
• A transversal is a line crossing two or more other lines, creating angle pairs.
• For parallel lines cut by a transversal: corresponding angles are equal, alternate angles are equal.
• Equal corresponding angles can be used as proof that two lines are parallel.