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

This website helps to find the measure of the fourth angle of a quadrilateral given the three other angle measures.

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.

Describes the special relationships of the sides, angles, and diagonals of a rhombus.

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

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