A note for the parent
What your child had to do in this Triangles problem
This was not a watch-and-copy exercise. The student had to make 4 small mathematical decisions and correct any wrong turns before moving forward.
The skill being built
Reasoning, not answer recognition
The parallel lines and the crossing at give a pair of similar triangles, , by AA. Writing the correspondence in the right order gives , and cross-multiplying finishes the proof.
The mistake we watch for
A wrong answer is useful evidence
Matching with because both lie on side . In and , matches : they sit on the same line through , at the equal alternate angles.
What happens when a step goes wrong?
The choice is crossed out
The app does not pretend the mistake did not happen.
The reason is explained
The child sees the exact misconception behind that choice.
The child tries again
The app guides, but the student still makes the next decision.
If this teaching style helps
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