Quadrilaterals

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Formula and description of the perimeter of a rhombus.

Formula for the area of a rhombus

Formula and description of the perimeter of a rectangle.

Definition and properties of the Golden Rectangle

Definiton and properties of the diagonals of a rectangle

An interesting example of how cleverly-designed rectangular shapes creates a useful metric standard for paper sizes.

Area of a rectangle. Definition and formula

Rectangle definition and properties

Quadrilateral definition and properties

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

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