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Paper 2
Angles & Shapes
Foundation
Parallel line angle facts are fast marks.
Key Facts
- Interior angles of polygon = (n-2) × 180°.
- Exterior angles sum to 360°.
Topics Covered
Angle Facts
What you need to know
- •Triangle angles sum to 180°.
- •Angles on a straight line sum to 180°.
Exam Tips
- Mark known angles on the diagram first.
Polygons
What you need to know
- •Interior sum = (n-2) × 180°.
- •Regular polygon angles are equal.
Exam Tips
- Use interior sum then divide by n.
Key Terms
Alternate angles
Equal angles formed by a transversal across parallel lines.
Regular polygon
All sides and angles are equal.
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Common Exam Questions
Find the interior angle of a regular octagon.
2 marksmediumPaper 2
Model Answer
135°
What examiners want to see
- ✓Use (n-2)×180 then divide by n.
Angles around a point sum to?
1 markeasyPaper 2
Model Answer
360°
What examiners want to see
- ✓Recall the fact quickly.
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