CTET · Chapter Test
Geometry (Classes VI–VIII) — 25-Question Test
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Key Concepts — Quick Reference
This chapter
Angle facts you must compute on sight
| Angles on a straight line | add to 180° (linear pair) |
|---|---|
| Angles at a point | add to 360° |
| Complementary angles | add to 90° |
| Supplementary angles | add to 180° |
| Vertically opposite angles | are equal |
| Co-interior (parallel lines) | add to 180°; alternate & corresponding are equal |
Triangle & polygon properties
| Angle sum of a triangle | = 180° |
|---|---|
| Exterior angle of a triangle | = sum of the two opposite interior angles |
| Angle sum of a quadrilateral | = 360° |
| Interior-angle sum of an n-gon | = (n − 2) × 180° |
| Each interior angle of a regular n-gon | = (n − 2) × 180° ÷ n |
| Sum of exterior angles of any polygon | = 360° (one per vertex) |