Lessons

Prove the Pythagorean Identity using the unit circle
In this lesson you will prove the Pythagorean Identity by using the equation of the unit circle.
Resources
Prove the Pythagorean identity sin2(θ) + cos2(θ) = 1 and use it to find sin(θ), cos(θ), or tan(θ) given sin(θ), cos(θ), or tan(θ) and the quadrant of the angle.
In this lesson you will prove the Pythagorean Identity by using the equation of the unit circle.