Question

Which of the following concepts can you use for right angles, and which can you use for non right angles?

Pythagorean theorem
using proportions in similar triangles
trig ratios: SOH, CAH, TOA
law of sines and cosines
30-60-90 and 45-45-90 triangles patterns

Answer 1

Pythagorean Theorem -- Used for right triangles (triangles with one right angle)
Using proportions in similar triangles -- Used for non-right triangles
Trig ratios SOH CAH TOA -- Used for right triangles
Law of sines and cosines -- Used for non-right triangles
30-60-90 and 45-45-90 triangles -- Used for right triangles