• ## I can formulate proofs involving congruent triangles and angle properties.

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# Angle Rules

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### Co-Interior Angles – When two lines are cut by a third line (transversal) co-interior angles are between the pair of lines on the same side of the transversal. If the lines are parallel the co-interior angles are supplementary (add up to 180 degrees).

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# Triangle Congruency Rules

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## RHS (Right-angled Triangles) – Right, Hypotenuse, Side

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## SSS – Side, Side, Side Congruence

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## SAS – Side, Angle, Side

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## AAS – Angle, Angle, Side

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# Proofs

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### One common mistake is that ‘AAA’ is NOT a congruency rule. Triangles can have the same three angle measures, but it does not mean that the triangles are congruent.

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