Interactive Unit Circle

Sine, Cosine and Tangent ... in a Circle or on a Graph.

Sine, Cosine and Tangent

Sine, Cosine and Tangent (often shortened to sin, cos and tan) are each a ratio of sides of a right angled triangle:

sin=opposite/hypotenuse cos=adjacent/hypotenuse tan=opposite/adjacent

For a given angle θ each ratio stays the same
no matter how big or small the triangle is