How do you find the area of a 4-sided polygon?

1 Answer
Sep 25, 2016

There are formulae for the common quadrilaterals, else find the area of two triangles and add them together.


A 4-sided polygon is a quadrilateral. This is family of well-known shapes. Most of them have their own formula for area:

Trapezium: #A = ((a+b)xxh)/2#

Parallelogram/Rhombus: #A = bxx h#

Rectangle: #A = lxx b#

Kite/Rhombus/square: #A = (d_1 xx d_2)/2#

Square: #A = s xx s#

For any other quadrilateral, divide the shape into two triangles, find the area of each and add them together.