SSS similarity criterion
Two triangles are similar if all three corresponding sides are proportional.
Practice This ConceptMain explanation
Teacher explanation
When every matching side ratio is the same, the triangle keeps the same shape and only the size changes. This is why three proportional sides are enough.
Example
Sides 7 cm, 9 cm, 12 cm and 14 cm, 18 cm, 24 cm are proportional in the ratio 1:2, so the triangles are similar.
Simple analogy
Three sides, one ratio.
Common confusion
Students sometimes check only two side ratios or mix up the side order.
Exam tip
Always compare sides in matching order before concluding SSS similarity.
Answer writing and exam use
1-mark use
Write the exact meaning of sss similarity criterion in one clean line.
2-mark use
Define sss similarity criterion and add one example or condition.
3-mark use
Explain sss similarity criterion, show the method or example, and mention the common mistake.
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