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Geometry questions are a major part of the GL 11+ exam. You need to know the properties of 2D shapes, understand angle rules, and be able to identify different types of triangles and quadrilaterals. This lesson covers the key facts and techniques.
| Type of angle | Size | Diagram hint |
|---|---|---|
| Acute | Less than 90° | Small and sharp |
| Right angle | Exactly 90° | Square corner |
| Obtuse | Between 90° and 180° | Wide opening |
| Straight line | Exactly 180° | Flat line |
| Reflex | Between 180° and 360° | More than a half turn |
| Full turn | Exactly 360° | Complete circle |
Angles on a straight line add up to 180°.
Worked Example: Two angles on a straight line are 115° and x°. Find x.
Angles around a point add up to 360°.
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