Interactive resource
Acute trig ratios
Trigonometry. Change an acute angle in a right triangle and read sin, cos, tan. Free interactive GeoGebra resource — adjust parameters in the browser.
Overview
Change an acute angle in a right triangle and read sin, cos, tan.
Explanation
In a right triangle, for acute θ: sin θ = opposite/hypotenuse, cos θ = adjacent/hypotenuse, tan θ = opposite/adjacent.
On the unit circle the terminal point is (cos θ, sin θ).
Opposite and adjacent are relative to the angle you are looking at.
How to use
Drag the point on the circle; values and segments update on the right.