You could easily calculate triangle area by our online calculator.
There are several formulas by which you can calculate triangle's area.
 If we know triangle's height and base we could calculate it's area by the next formula:
S=1/2bh
 Also you could calculate triangle's area by using Geron's formula, by which it can be done if you know perimeter or length of all it's legs:
S= √p(pa)(pb)(pc)
where p  halfperimeter of triangle
 As well as in examples above you may calculate triangle's area by two legs' length and angle between them:
S=1/2ab sin(α)
The area of the triangle through the base and height 

The area of the triangle through Heron's formula through knowing the perimeter and the length of all sides 

The area of the triangle and two sides of the angle between them 
