[tex]\bf\red{ arie_{triunghi \: oarecare} = \frac{b \times h}{2} }[/tex]
[tex]\bf\red{ arie_{triunghi \: dreptunghic} = \frac{ cateta_{1} \times cateta_{2} }{2} = \frac{ip \times h}{2} }[/tex]
[tex]\bf\red {arie_{triunghi \:isoscel} = \frac{b \times h}{2} }[/tex]
[tex]\bf\red{ arie_{triunghi \: echilateral} = \frac{latura^{2}\sqrt{3} }{4} }[/tex]