Learn how to use the unit circle to define sine, cosine, and tangent for all real numbers.

Explore the world of trigonometry by mastering right triangles and their applications, understanding and graphing trig functions, solving problems involving non-right triangles, and unlocking the power of …

Sal shows how, for acute angles, the two different definitions of the trigonometric values (SOH CAH TOA and the unit circle definition) result in the same values.

Review the unit circle definition of the trigonometric functions.

Sal explains the definition and motivation for radians and the relationship between radians and degrees.

Discover how to measure angles, distances, and heights using trigonometric ratios and the unit circle. Learn how to use sine, cosine, and tangent to solve real-world problems involving triangles and …

Radians are a unit to measure angles, just like degrees. A full circular angle equals 2π radians so 2π radians=360° and on dividing by 2 on both sides, π radians=180°. if you remember this , you will be …

Explore geometry concepts related to circles, including properties, formulas, and applications, through engaging lessons and exercises on Khan Academy.

The unit circle is a circle with a radius of 1 centered at the origin. We can use the unit circle to help define the trigonometric functions and visualize their values.

Knowing trig identities is one thing, but being able to prove them takes us to another level. In this unit, we'll prove various trigonometric identities and define inverse trigonometric functions, which allow us …