Six different types of quadrilaterals
Edges and Vertices
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.
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 also uses the below concept.
This is our own explanation, it is not taken from Wikipedia.)
To construct a quadrilateral
when 3 sides( x units, y units and z units) and 2 included angles are known
• Draw a line segment AB = x units.
• Make angles of 60and 90at A and B
• With B as the centre and radius 4.5 units, we make an arc on the
• With A as the centre and radius 4 cm we make an arc on the ray
• Join the points D and C to obtain the required quadrilateral.
• Obtain the required D and C to obtain the required Quadrilateral