Plan your proof on the diagram, then build it one step at a time
How this works. You get a diagram, what is given, and what to prove. 1. Plan: click two sides (or two angles) of the diagram to say you will show they are congruent. You get an instant yes or no. 2. Build: then build the proof one step at a time: choose a statement and type the reason in your own words (suggestions appear as you type). The app checks every step. Remember: you can never use the way a picture looks as a reason.
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Hover to see names. Longer segments on a line (like AC when a point lies on it) are the dashed bars beside the line.
Plan
Pair up the sides or angles you think your proof will show are congruent. Make one pair for every fact your proof will need.
Your proof
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