Category
Right Triangles
How to Solve a Right Triangle
A step-by-step method for finding every unknown side and angle in a right triangle using the trig ratios, inverse functions, and the Pythagorean theorem.
SOHCAHTOA Explained: The Trig Ratios Made Simple
SOHCAHTOA is a six-letter memory trick that hands you the three core trig ratios, and this guide shows what each piece means with a worked example.
Solving a Right Triangle From Any Two Given Values
Every solvable right triangle starts from one of four input patterns — angle-and-hypotenuse, angle-and-leg, two legs, or leg-and-hypotenuse. Four fresh worked examples cover all four.
Inverse Trig Domains and Ranges: Why arcsin(sin x) Isn't Always x
arcsin, arccos, and arctan each return values from a restricted range, never the full circle. Real examples show what that restriction means, and where it trips people up.