

$$2p = {S}_{1} + {S}_{2} + {S}_{3}$$
Perimeter
$$A = \frac{b \times h}{2}$$
Area
$$b = \frac{A \times 2}{h}$$
$$h = \frac{A \times 2}{b}$$
$$A = \sqrt{p \times (p  {S}_{1}) \times (p  {S}_{2}) \times (p  {S}_{3}) }$$
Heron's Formula
Definition
A triangle is a polygon with three sides.
Properties
 Generic Triangle's formulas are valid for any triangles
Generic Triangle Formulas
Data  Formula 

Perimeter  2p = S_{1} + S_{2} + S_{3} 
Area  A = (b × h) / 2 
Base  b = (A × 2) / h 
Height  h = (A × 2) / b 
Heron's Formula  A = √[ p × (p  S_{1}) × (p  S_{2}) × (p  S_{3}) ] 