How much does a four sided polygon equal??
How much WHAT does a four-sided polygon equal?
How many degrees, like a triangle equals 180 degrees
http://www.mathsisfun.com/geometry/interior-angles-polygons.html
The sum of the internal angles of any four-sided polygon (which is also called a quadrilateral) is 360 degrees.
Sum of measures of interior angles of a polygon of n sides = (n - 2 )*180 deg
polygon with 4 sides,
n = 4
(n - 2)*180
(4 - 2)*180
2*180 = 360