Question

how do I find out how to solve a triangle

Answer 1

what exactly are you asking. Are you asking for area or perimeter?

Answer 2

To solve a triangle you find all missing sides and angles.

For a right triangle use
Cos(angle)= adjacent/hypotenuse
Sin(angle)= opposite/hypotenuse
Tan(angle)= opposite/adjacent

Opposite ^2+ adjacent^2= hypotenuse^2


For non right triangles

Law of sines
SinA/a=SinB/b=SinC/c

Law of cosine
a^2= b^2+c^2-2bcCosA