Class 7 Math: Lines and Angles Quick Revision Chapter Summary

Need to review the entire chapter before a test? This quick revision guide summarizes all the core concepts, topics, and equations taught in Class 7 Lines and Angles to help you refresh your memory instantly.

Core Topics At a Glance

### 📌 Complementary and Supplementary angles Complementary angles sum to 90°. Supplementary angles sum to 180°.

### 📌 Adjacent and Vertically opposite angles Adjacent angles share a vertex and an arm. Vertically opposite angles are formed by intersecting lines, are opposite each other, and are equal.

### 📌 Pairs of lines: intersecting and parallel Intersecting lines meet at exactly one point. Parallel lines lie in the same plane and never meet, maintaining a constant distance.

### 📌 Transversal lines and alternate angles When a transversal intersects two parallel lines, alternate interior and alternate exterior angles are equal.

Key Formulas Mind Map

• Supplementary Angles: `\theta_1 + \theta_2 = 180^\circ` - Sum of supplementary angles is a straight angle....
• Complementary Angles: `\theta_1 + \theta_2 = 90^\circ` - Sum of complementary angles is a right angle....

Revision Checklist

1. Review the subtopic guides and outline notes.
2. Practice writing the key formulas from memory.
3. Solve at least 3 worked examples and check your steps.
4. Take a timed practice quiz to verify your speed.