Introduction to the trigonometric ratios
Trigonometric ratios in right triangles
Given the side lengths of a right triangle, find the sine, cosine, or tangent of one of the acute angles.
If you're seeing this message, it means we're having trouble loading external resources for Khan Academy.
If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.