Two triangles are similar if they have exactly the same shape. They may have different sizes though.
If two shapes are similar then one is an enlargement of the other.
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The union of two sets A and B is the set containing all the elements of A and B.
This question appears in the following syllabi:
|AQA GCSE (9-1) Foundation (UK)||G: Mensuration and Calculation||G19: Applying Congruence and Similarity||Similarity||-|
|CBSE IX (India)||Geometry||Triangles||Congruence and similarity||-|
|CBSE X (India)||Geometry||Triangles||Similar triangles||-|
|CIE IGCSE (9-1) Maths (0626 UK)||3 Geometry||B3.4 Similar Figures||Similarity||-|
|Edexcel GCSE (9-1) Foundation (UK)||G: Mensuration and Calculation||G19: Applying Congruence and Similarity||Similarity||-|
|GCSE Higher (UK)||Geometry||Properties of shapes||Similarity||-|
|OCR GCSE (9-1) Foundation (UK)||9: Congruence and Similarity||9.04c: Similar Shapes||More Lengths in Enlargements||-|
|Universal (all site questions)||P||Properties of shapes||Similarity||-|
More in this topic
3 Triangles 2
5 Example 1
6 Example 2