Geometry videos

Angles, parallel lines, & transversals

Parallel & perpendicular lines

Missing angles with a transversal

Measures of angles formed by a transversal

Angles in a triangle sum to 180° proof

Isosceles & equilateral triangles problems

Triangle exterior angle example

Worked example: Triangle angles (diagram)

Worked example: Triangle angles (intersecting lines)

Triangle angle challenge problem

Triangle angle challenge problem 2

Intro to the Pythagorean theorem

Pythagorean theorem example

Pythagorean theorem with isosceles triangle

Use Pythagorean theorem to find area of an isosceles triangle

Pythagorean theorem word problem: fishing boat

Pythagorean theorem word problem: carpet

Pythagorean theorem in 3D

Distance formula

Garfield's proof of the Pythagorean theorem

Bhaskara's proof of the Pythagorean theorem

Another Pythagorean theorem proof

Pythagorean theorem proof using similarity

Cylinder volume & surface area

Volume of a sphere

Volume of a cone