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

Sep 25, 2016

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

Explanation:

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

Trapezium: $A = \frac{\left(a + b\right) \times h}{2}$

Parallelogram/Rhombus: $A = b \times h$

Rectangle: $A = l \times b$

Kite/Rhombus/square: $A = \frac{{d}_{1} \times {d}_{2}}{2}$

Square: $A = s \times s$

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