Chapter 5 · Class 7 CBSE · Formula Sheet

Parallel & Intersecting Lines Formulas — Class 7 CBSE

Identify and explore properties of parallel and intersecting lines and angles.

Key Formulas

Angles on a Straight Line

\angle 1 + \angle 2 = 180°

Angles at a Point

\angle 1 + \angle 2 + \angle 3 + \cdots = 360°

Corresponding Angles (parallel lines)

\angle 1 = \angle 5

Alternate Interior Angles

\angle 3 = \angle 5

Co-interior Angles

\angle 3 + \angle 6 = 180°

Worked Examples

1Using: Supplementary Angles

If one angle is 65 degrees, find its supplement.

Step 1: Supplement = 180 - 65

Step 2: = 115 degrees.

Answer: 115 degrees

2Using: Vertically Opposite

Two lines intersect. If one angle is 40 degrees, find the vertically opposite angle.

Step 1: Vertically opposite angles are equal.

Step 2: The angle = 40 degrees.

Answer: 40 degrees

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More Class 7 CBSE Formulas

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Frequently Asked Questions

How many formulas are in Class 7 CBSE Parallel & Intersecting Lines?+
There are 5 formulas in the Parallel & Intersecting Lines chapter for Class 7 CBSE. Each formula is essential for solving problems in this topic.
How to remember Parallel & Intersecting Lines formulas easily?+
Practice regularly with worked examples, group related formulas together, and use SparkEd's interactive practice mode to reinforce your memory through problem-solving.
Are these Parallel & Intersecting Lines formulas enough for exams?+
Yes, these formulas cover the complete CBSE Class 7 syllabus for Parallel & Intersecting Lines. Practice applying them to different types of questions for full exam readiness.

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