Also Quadrilateral, Quadrangle
Because a tetragon has an even number of sides, in a regular tetragon, opposite sides are parallel. A regular tetragon is a square.
|Interior angle||90°||Like any regular polygon, to find the interior angle we use the formula (180n–360)/n . For a tetragon, n=4. See Interior Angles of a Polygon|
|Exterior Angle||90°||To find the exterior angle of a regular tetragon, we use the fact that the exterior angle forms a linear pair with the interior angle, so in general it is given by the formula 180-interior angle. See Exterior Angles of a Polygon|
|Area||s2||Where S is the length of a side. To find the area of a tetragon or any polygon, using various methods, see Area of a Regular Polygon and Area of an Irregular Polygon|
|Number of diagonals||2||The number of distinct diagonals possible from all vertices. (In general ½n(n–3) ). In the figure above, click on "show diagonals" to see them. See Diagonals of a Polygon|
|Number of triangles||2||The number of triangles created by drawing the diagonals from a given vertex. (In general n–2). In the figure above, click on "show triangles" to see them. See Triangles of a Polygon|
|Sum of interior angles||360°||In general 180(n–2) degrees . See Interior Angles of a Polygon|