What is a Radian?
This is an applet illustrating what a radian is. This wasn't made by me but by a math teacher colleague.
for intersecting lines,vertically opposite angles are equal
Transformation octahedron in cubeoctahedron
Algebra 2 Project: castle
Spreadsheet and Histogram
Multiplying by numbers using vectors
Geometric Intuition of Multiplying Complex Numbers
coplanar and point and lines