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

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Answer 1 · 2016-09-25T11:42:29

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.