# How to Prove a Right Angle in Math?

A right angle is a 90 degree angle that forms where perpendicular 180 degree lines meet or cross. Proving that a polygon such as a square, rectangle or triangle has a right angle requires knowledge...
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http://www.ehow.com/how_8151138_prove-right-angle-math.html

## How to Prove Angle-Angle Similarity?

A proof for an angle-angle similarity requires three steps to show that two different angles on two triangles are congruent. Because the triangles have two congruent angles, the triangles are simil...
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http://www.ehow.com/how_8438932_prove-angleangle-similarity.html

## How to Prove an Angle is at 90 Degrees?

In mathematics, an angle is defined as two rays that share the same endpoint. The point where the rays meet, or intersect, is called the vertex. The two rays, or line segments, are considered the s...
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http://www.ehow.com/how_8310334_prove-angle-90-degrees.html

## How to Prove the Angle Sum Property of a Triangle?

To prove that the sum of all angles of a triangle is 180 degrees, follow these steps. Let's take a triangle ABC .

http://www.wikihow.com/Prove-the-Angle-Sum-Property-of-a-Triangle

## Math Equations to Prove Things in Everyday Life?

Equations from mechanical physics, algebra and geometry define everything from how to save money for future retirement to how to buy enough paint to repaint a room Mathematics is all around us, an...
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http://www.ehow.com/info_8359917_math-prove-things-everyday-life.html