How to determine the area of a triangle given the coordinates of the three vertices using a formula
Math Open Reference
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Definiton and properties of a trapezoid (coordinate geometry) including altitude and median
Math Open Reference
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Area and perimeter of a square (coordinate geometry)
Math Open Reference
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Definiton and properties of a square (coordinate geometry)
Math Open Reference
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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
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How to determine if lines are perpendicular in coordinate geometry
Math Open Reference
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Circumscribed rectangle (or bounding box) is the smallest rectangle that contains all of a given set of points in coordinate geometry
Math Open Reference
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Interactive examples and theorems
Math Warehouse
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Different Types of Quadrilaterals and their attributes
Math Warehouse
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Definition and properties of a parallelogram. Includes a great picture.
Math Open Reference
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