Equation of a Line
The "Equation of a Line" applet allows you to select from a range of values for the gradient, m, and the y-intercept, c.
Read the blog An Introduction to the Vector Equation of a Line in
for more details.
Angle Bisectors- Euclidean
Area of Triangle
Quadrilateral Rotation about a Point
Multiply by i vectors
Geometric Intuition of Multiplying Complex Numbers
9.1.3 Pre #1103407 correct A