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Unit circle (video) | Trigonometry | Khan Academy Noble Mushtak. [cos (θ)]^2+ [sin (θ)]^2=1 where θ has the same definition of 0 above. This is similar to the equation x^2+y^2=1, which is the graph of a circle with a radius of 1 centered around the origin. This is how the unit circle is graphed, which you seem to understand well. Unit Circle Quiz - Memorize the Unit Circle by Chris Konstad Looking to quickly memorize the unit circle for a test or quiz Unit Circle - Math is Fun 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. Memorize unit circle game