Right Triangles Ladder¶
Who This Is For¶
Use this ladder when you already trust your geometry primitives and want to practice the first strong counting-geometry pattern: normalize directions and count perpendicular structure.
Warm-Up¶
- direction normalization
- perpendicular direction pairing
Core¶
- anchor one point and count valid angle pairs
- avoid floating-point slopes
Example Notes¶
Exit Criteria¶
You are ready to move on when you can:
- normalize directions with one stable sign convention
- count right-angle configurations without brute-forcing triples
- explain why integer normalization beats floating-point slope comparison
- connect the note back to Counting Geometry