For right-angled triangles, we have Pythagoras' Theorem and SOHCAHTOA. However, these methods do not work for non-right angled triangles. For non-right angled
Cosine Rule - Finding Angles
Area Of A Non-Right Angle Triangle
Non-right triangle trig
Area of Non-Right Angled Triangles
Non Right Angled Triangles
SOLUTION: Non right angled triangles and some practical
Right, Angled Triangle: How to find sides and angles and solve
Non Right Angled Triangles
Trigonometry in Triangles Without Right-Angles - Mathematics Stack
Summary of trigonometric formulas
Sine to Find the Area of a Triangle
Area of a Non-Right Angled Triangle #3
Section 4: Sine And Cosine Rule