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A helpful scientific calculator that runs in your web browser window.

This site outlines the theorems about parallelograms with proofs to these theorems.

A page with links for properties of circles and different types of polygons. Each link has great visuals with clear markings, definitions, and formulas.

Website gives a general overview of different types of quadrilaterals and how to identify them. Explains the properties of different quadrilaterals.

In this Early Edge video lesson, you'll learn more about Quadrilaterals, so you can be successful when you take on high-school Math & Geometry.

Formula and description of the perimeter of a square.

Definiton and properties of the diagonals of a square

Area of a square. Definition and formula

Definition and properties of a square. Describes how it can be considered a special case of other types of quadrilateral. Links to other related topics, including the area of a square.

Formula and description of the perimeter of a rhombus.

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