Learn the basic trigonometric ratios: sine, cosine, tangent
Memorize the SOH-CAH-TOA rule
Identify the right triangle
Choose the angle you are working with
Label the opposite, adjacent, and hypotenuse sides
Use sine for opposite over hypotenuse
Use cosine for adjacent over hypotenuse
Use tangent for opposite over adjacent
Rearrange formulas to find missing sides or angles
Use inverse trigonometric functions to find angles
Apply the Pythagorean theorem when needed
Practice with triangles, circles, and coordinate points
Use a calculator in degree or radian mode as required
Check answers for reasonableness
Solve many practice problems