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Example:Find Missing Angle in Quadrilateral.

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Explanation:

 

Quadrilateral

 

In Euclidean plane geometry, a quadrilateral is a polygon with four sides (or 'edges') and four vertices or corners. Sometimes, the term quadrangle is used, by analogy with triangle, and sometimes tetragon for consistency with pentagon (5-sided), hexagon (6-sided) and so on. The word quadrilateral is made of the words quad (meaning "four") and lateral (meaning "of sides").

 

Quadrilaterals are simple (not self-intersecting) or complex (self-intersecting), also called crossed. Simple quadrilaterals are either convex or concave.

 

The interior angles of a simple quadrilateral add up to 360 degrees of arc. (Our solved example in mathguru.com uses this concept)

 

This is a special case of the n-gon interior angle sum formula (n - 2)180°. In a crossed quadrilateral, the interior angles on either side of the crossing add up to 720°.

 

Quadrilateral


Six different types of quadrilaterals

Edges and vertices

4

Schläfli symbol

{4} (for square)

Internal angle (degrees)

90° (for square)

 

 

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

 

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.