A unit circle is an important part of trigonometry and can define right angle relationships known as sine, cosine and tangent.

Part of that is the way it's taught. Students are taught the "unit circle" and its relationship to trigonometry, but many fail to make the leap on how crucial circles are for trig functions.

Mastering degree-radian conversions is crucial for trigonometry and calculus. Radians simplify mathematical formulas, ...

Revise trigonometric ratios of sine, ... This circle has the centre at the origin and a radius of 1 unit. ... As the point P moves anti-clockwise round the circle from (1, 0), ...

Learn and revise trigonometric ratios of sine, ... This circle has the centre at the origin and a radius of 1 unit.