COORDINATE GEOMETRYAssuming the points A (X1, Y1) and B (X2, Y2) Distance between 2 points

Midpoint of the line joining the 2 points

Gradient

Equation of a straight line

Where M is the gradient, X1 and Y1 is a point

Gradients of parallel lines

The gradient of L1 and L2 are the same

Gradients of 2 perpendicular lines

Vertices of a parallelogram ( Rhombus, Rectangle, Square )