🔢 Mathematics · Geometry

Angles in triangles (age 12+)

Know and use the criteria for triangle congruence (SSS, SAS, ASA, RHS), use standard labelling conventions for sides and angles of triangle ABC, and determine whether two triangles are congruent

Typical age: 12–14 years

“If your child is shown two triangles where all three sides of one match all three sides of the other, can they explain why those triangles must be identical in shape and size?”

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Needs first

Measuring angles (age 11+)REQUIRED
Determining congruence requires constructing triangles from given conditions
Types of angles (age 11+)REQUIRED
Triangle congruence criteria require standard labelling conventions

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