Geometry formulas for area and perimeter of shapes

Triangle

Triangle
$$\textbf{Area of the triangle}$$
$$A = \frac{1}{2} · h · b$$Calcular
$$\textbf{or}$$
$$A = \sqrt{s · (s - a) · (s - b) · (s - c)} ,$$
$$ s =\frac{a + b +c}{2}$$Calcular
$$\textbf{Perimeter of the triangle}$$
$$P = a + b + c$$Calcular