The "Unit Circle" is a circle with a radius of 1.
Being so simple, it is a great way to learn and talk about lengths and angles.
The center is put on a graph where the x axis and y axis cross, so we get this neat arrangement here.
Sine, Cosine and Tangent
Because the radius is 1, we can directly measure sine, cosine and tangent.
What happens when the angle, θ, is 0°?
cos 0° = 1, sin 0° = 0 and tan 0° = 0
What happens when θ is 90°?
cos 90° = 0, sin 90° = 1 and tan 90° is undefined
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