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Example: Find Angles in Triangle

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Explanation:

 

 

Angle

 

In geometry, an angle is the figure formed by two rays sharing a common endpoint, called the vertex of the angle. The magnitude of the angle is the "amount of rotation" that separates the two rays, and can be measured by considering the length of circular arc swept out when one ray is rotated about the vertex to coincide with the other (see "Measuring angles", below). Where there is no possibility of confusion, the term "angle" is used interchangeably for both the geometric configuration itself and for its angular magnitude (which is simply a numerical quantity).


 

, the angle symbol

 

http://en.wikipedia.org/wiki/Angle

 

Triangle

 

A triangle is one of the basic shapes of geometry: a polygon with three corners or vertices and three sides or edges which are line segments. A triangle with vertices A, B, and C is denoted  ABC.

Triangle


A triangle

 

http://en.wikipedia.org/wiki/Triangle

 

The above explanation is copied from Wikipedia, the free encyclopedia and is remixed as allowed under the Creative Commons Attribution- ShareAlike 3.0 Unported License.

 

(Our solved example in mathguru.com uses the below concept. This is our own explanation, it is not taken from Wikipedia.)

 

The sum of all the angles of a Triangle is 180(Angle Sum Property of a Triangle)