MA26-03 Maths Coming soon
Congruent triangles: SSS, SAS, ASA and RHS
MA26-03
This lesson is coming soon.
In this lesson
Identify congruent triangles and select the correct congruence criterion (SSS, SAS, ASA or RHS), rejecting invalid matches like SSA or an unjustified RHS.
What it covers
- The four congruence criteria: SSS, SAS, ASA, RHS
- Identifying which pairs of triangles are congruent from marked/given information
- Naming the correct criterion, not just concluding 'congruent'
- Explicit non-examples: SSA is not a valid criterion; a right angle alone does not mean RHS applies
Key words
For: AQA GCSE 8300, Edexcel GCSE 1MA1, Eduqas GCSE C300, OCR GCSE J560
On the specification
| Board | Spec | Statement |
|---|---|---|
| AQA GCSE 8300 | G5 | Use the basic congruence criteria for triangles (SSS, SAS, ASA, RHS) |
| Edexcel GCSE 1MA1 | G5 | Use the basic congruence criteria for triangles (SSS, SAS, ASA, RHS) |
| Eduqas GCSE C300 | FG5 | Use the basic congruence criteria for triangles (SSS, SAS, ASA, RHS) |
| Eduqas GCSE C300 | HG5 | Use the basic congruence criteria for triangles (SSS, SAS, ASA, RHS) |
| OCR GCSE J560 | 9.02a | Identify congruent triangles. |
For teachers
This GCSE Maths lesson teaches congruent triangles: SSS, SAS, ASA and RHS. By the end, students should be able to identify congruent triangles and select the correct congruence criterion (SSS, SAS, ASA or RHS), rejecting invalid matches like SSA or an unjustified RHS. It works through two worked examples and the mistakes examiners report.