An interactive applet that allows you to see the effects of changing the coeeficients in a quadratic function using sliders
Math Open Reference

QED: definition
Math Open Reference

Definition of a pentagon
Math Open Reference

Formula and description of the perimeter of a kite.
Math Open Reference

How to determine the area of a triangle given the coordinates of the three vertices using a bounding rectangle
Math Open Reference

How to determine the area of a triangle given the coordinates of the three vertices using a formula
Math Open Reference

Definiton and properties of a trapezoid (coordinate geometry) including altitude and median
Math Open Reference

Area and perimeter of a square (coordinate geometry)
Math Open Reference

Definiton and properties of a square (coordinate geometry)
Math Open Reference

Definition of the slope of a line given the coordinates of two points on the line, includes slope as a ratio and an angle.
Math Open Reference
