How many questions are in this quiz?

This quiz has 119 questions on triangle congruence and similarity criteria.

No. Each question has 4 options and there is no timer, so you can work at your own pace.

How do I choose question count and difficulty?

Use the start panel to select how many questions you want and set the difficulty level; Mixed combines easy, medium, and hard items.

What’s a common mistake this quiz helps fix?

A frequent error is using SSA as a congruence test or using AA to claim congruence; the quiz drills the correct conclusions.

Triangle congruence and similarity criteria

Q: What criteria are covered in the questions?

You’ll see SSS, SAS, ASA, AAS, and HL for congruence, plus AA, SAS~, and SSS~ for similarity.

About this quiz

What you’ll practice

Triangle proofs get easier when you can quickly spot the right criterion. This quiz focuses on recognizing when triangles are congruent versus merely similar, and what that implies about corresponding parts.

You’ll work with classic criteria—SSS, SAS, ASA, AAS, and HL for congruence, plus AA, SAS~, and SSS~ for similarity—along with scale factors, proportional sides, and angle relationships.

Quiz format and difficulty

Each question has 4 options and there’s no timer, so you can reason carefully instead of rushing. Before you start, pick how many questions you want to answer and set the difficulty; “Mixed” blends straightforward identification items with multi-step reasoning.

To keep things fair, easier questions emphasize direct pattern recognition, while harder ones add extra markings, indirect information, or require choosing what you can (and cannot) conclude.

Common pitfalls to avoid

Mixing up congruence (same size/shape) with similarity (same shape, scaled)
Treating SSA as a valid congruence test (it usually isn’t)
Forgetting HL applies only to right triangles and needs hypotenuse + a leg
Assuming “looks equal” from a diagram instead of using given markings/labels
Using AA to claim congruence (AA proves similarity, not congruence)

Tips for better accuracy

Match corresponding vertices consistently before comparing sides/angles, and write proportions in the same order for both triangles. When a problem asks what must be true, focus on the minimum information required by the criterion, not extra facts that aren’t guaranteed.