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  1. 11+
  2. Year 5
  3. 2D Shapes: Triangles, Quadrilaterals and Polygons
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Angles in Triangles and on Parallel Lines (1)

In this worksheet, students use angle rules to work out the missing angles in triangles and parallel lines.

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'Angles in Triangles and on Parallel Lines (1)' worksheet

Key stage:  KS 2

Year:  Year 5 11+ worksheets

Curriculum topic:   Maths and Numerical Reasoning

Curriculum subtopic:   2D Shapes: Triangles, Quadrilaterals and Polygons

Difficulty level:  

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Worksheet Overview

Look at the following diagram.

 

Angle aº = 58º because it is alternate to the 58º on parallel lines (Z or S shape)

 

Angle bº = 48º because it is alternate to the 48º on parallel lines (Z or S shape)

 

Angle cº = 180º - 48º - 58º = 74º for two reasons.....angles in a triangle add up to 180º and angles on a straight line add up to 180º

 

Angle dº = 180º - 58º = 122º because angles on a straight line add up to 180º

 

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