Right triangles - those with a 90-degree angle.
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Right angle triangles
The Pythagorean theorem is a2 + b2 = c2. It is used for right triangles. If you know two of the sides, you can use the theorem to find the third side.
Cut them into triangles and use the pythagorean theorem
Combinatorics is a part of math focused on counting principles of finite quantities. It does not really have much to do with triangles, much less the Pythagorean theorem.
The HA and HL theorems for right triangles or the Pythagorean theorem might be of use.