Congruent triangles
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Congruent shapes
Two shapes are congruent when one fits exactly on the other.
Congruence by SSS
Three matched sides fix a triangle completely.
Congruence by SAS
Two sides and the angle between them.
Congruence by ASA
Two angles and a matched side.
Congruence by RHS
A right angle, the hypotenuse and one other side.
Proving two triangles congruent
Pairing up the given facts, choosing the criterion they satisfy.
Proofs using congruent triangles
Proving results such as the isosceles base angles by finding a pair of.
Practice
Practice
Congruent shapes
Two shapes are congruent when one fits exactly on the other.
PracticeCongruence by SSS
Three matched sides fix a triangle completely.
PracticeCongruence by SAS
Two sides and the angle between them.
PracticeCongruence by ASA
Two angles and a matched side.
PracticeCongruence by RHS
A right angle, the hypotenuse and one other side.
PracticeCongruent triangles review
Deciding whether two triangles are congruent and naming the criterion.