grade 10 · GEOM-004

Choose a congruence criterion

Decide whether marked side and angle information proves SSS, SAS, ASA, AAS, or HL.

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The diagram marks two angle pairs and the included side as congruent. Which theorem proves the triangles congruent?

Let's work it out together.

Work through one checkpoint at a time. Your answer area opens after the reasoning.

Checkpoint 1

Inventory only the marked facts.
Checkpoint 2

Decide whether the known side lies between two known angles or the known angle lies between two sides.
Checkpoint 3

Use HL only when both triangles are right triangles.