en.wikipedia.org/wiki/Quadrilateral

Some types of quadrilaterals. Edges and vertices, 4. Schläfli symbol, {4} (for
square). Area, various methods; see below. Internal angle (degrees), 90° (for
square and rectangle). In Eucli...

www.mathsisfun.com/quadrilaterals.html

A Quadrilateral has four-sides, it is 2-dimensional (a flat shape), closed (the lines
... Some types are also included in the definition of other types! ... Other Names.

www.reference.com/math/different-kinds-quadrilaterals-56dfcf7620c2352b

There are primarily six different types of quadrilaterals used in geometry. These
are parallelogram, rectangle, square, ... What types of quadrilaterals have four
congruent sides? ... area of a semicircle? What is the name of a 10-sided polygon
?

www.math-only-math.com/different-types-of-quadrilaterals.html

Different types of quadrilaterals are explained with their definition and properties
along with the diagram. Parallelogram A quadrilateral is called a parallelogram.

www.montereyinstitute.org/courses/DevelopmentalMath/COURSE_TEXT2_RESOURCE/U07_L2_T1_text_final.html

Picking apart the name “quadrilateral” helps you understand what it refers to. The
prefix “quad-” ... A quadrilateral also has four angles formed by its four sides. ...
The other special case of a parallelogram is a special type of rectangle, a square.

www.cut-the-knot.org/Curriculum/Geometry/Quadrilaterals.shtml

Quadrilateral is a geometric shape that consists of four points (vertices)
sequentially ... summarize the relationship between various kinds of
quadrilaterals: ... Here is a list of all the properties of quadrilaterals that we have
mentioned along with ...

www.ask-math.com/types-of-quadrilateral.html

This page is about types of quadrilateral. ... In this section we will discuss different
types of quadrilateral. Quadrilateral : It is a closed figure formed by 4 line ...

www.mathcaptain.com/geometry/types-of-quadrilaterals.html

The quadrilaterals are those which are four sided closed figures. The
quadrilaterals can be classified into different types according to their properties. It
is very ...

thinkmath.edc.org/resource/shape-quadrilateral

A quadrilateral is a polygon that has exactly four sides. ... Just as triangles and
quadrilaterals are special types of polygons, there are many subclasses of ... The
square is also the name of the regular quadrilateral -- one in which all sides are ...

www.1728.org/quadltrl.htm

Quadrilaterals, Six Types of Quadrilaterals, Trapezoid, Trapezium, Kite, ... A
quadrilateral is a geometric figure having four sides and four angles which
always ...