Measurement formulas

The area of a simple, closed, planar curve is the amount of space inside.

Area is measured in square units.

Area Formulas
Shape	Formula	Variables
Square	$A = s^{2}$	$s$ is the length of the side of the square.
Rectangle	$A = L W$	$L$ and $W$ are the lengths of the rectangle's sides (length and width).
Triangle	$A = \frac{1}{2} b h$	$b$ and $h$ are the base and height
Triangle	$\begin{array}{l} A = \sqrt{s (s - a) (s - b) (s - c)} \\ where s = \frac{a + b + c}{2} \end{array}$	$a$ , $b$ , and $c$ are the side lengths and $s$ is the semiperimeter
Parallelogram	$A = b h$	$b$ is the length of the base and $h$ is the height.
Trapezoid	$A = \frac{b_{1} + b_{2}}{2} h$	$b_{1}$ and $b_{2}$ are the lengths of the parallel sides and $h$ the distance (height) between the parallels.
Circle	$A = π r^{2}$	$r$ is the radius.

GAYATHRI D