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A quadrilateral is a four-sided polygon (quad means four and lateral means side) and the sum of the angles of a quadrilateral is 360 degrees.
http://answers.ask.com/Science/Mathematics/how_man...
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An angle is formed when two lines (or line segments) meet at a single point. Angles are classified into distinct groups based on their measurement in degrees. Acute angles measure
http://www.ehow.com/info_8367679_degrees-quadrilat...
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always 360 degrees on a flat plane, however if it is drawn on a sphere it shall be different.
http://wiki.answers.com/Q/What_is_the_degree_of_a_...
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Squares and rhombuses (rhombi?).
http://wiki.answers.com/Q/What_quadrilaterals_bise...
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