Khan Academy

Radius, diameter, circumference & π-video (K-A)

Surface area using a net: rectangular prism (K-A)

Intro to the Pythagorean theorem (K-A)

Intro to the Pythagorean theorem 2 (K-A)

Introduction to the Pythagorean theorem (K-A)

Pythagorean theorem example (K-A)

Pythagorean theorem II (K-A)

Pythagorean theorem with isosceles triangle (K-A)

Pythagorean theorem word problem: carpet (K-A)

Pythagorean theorem word problem: fishing boat (K-A)

Another Pythagorean theorem proof (K-A)

Bhaskara's proof of the Pythagorean theorem (K-A)

Garfield's proof of the Pythagorean theorem (K-A)

Pythagorean theorem proof using similarity (K-A)

30-60-90 triangle example problem (K-A)

Area of a regular hexagon (K-A)

Intro to the trigonometric ratios (K-A)

Special right triangles intro (part 1) (K-A)

Special right triangles intro (part 2) (K-A)

Special right triangles proof (part 1) (K-A)

Hypotenuse, opposite, and adjacent (K-A)

Special right triangles proof (part 2) (K-A)

Trigonometric ratios in right triangles (K-A)

Special right triangles review (K-A)

Trigonometric ratios in right triangles-video (K-A)