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Bar Models•
Calculating Angles•
Lines and Angles

Angles in Triangles (A) WORKSHEET

Suitable for Year groups: Year 7, Year 8
GCSE Tier: Foundation
Targeting grades: 1-3
Prerequisite knowledge: Using bar models to solve missing number problems. Addition and subtraction within 180.
Learning Objective: Derive and use the sum of angles in a triangle.

Angles in Triangles (A) WORKSHEET DESCRIPTION

This worksheet will help students practise calculating missing angles in triangles using the angle sum rule.

Section A begins with a guided example, and bar models are used throughout to support calculations.

Section B asks learners to decide whether triangles are feasible or not based on their angle sum, providing a selection of both examples and non-examples.

In Section C, pupils tackle ten minimally different questions that build reasoning skills step by step.

Section D extends the practice with a wider variety of angle problems, including those where angles are expressed in ratio.

All worksheets are created by the team of experienced teachers at Cazoom Maths.

Angles in Triangles (A) worksheet

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Frequently Asked Questions

Students should be comfortable using bar models to solve missing number problems, as these visual representations are featured throughout the worksheet to support their calculations. They'll also need solid addition and subtraction skills within 180, since triangle angles always sum to this total.