Triangle Calculator

Triangle Calculator

Calculate the perimeter and area of a triangle using Heron’s formula.

For sides \(a\), \(b\), and \(c\): $$ \text{Perimeter} = a+b+c,\quad s=\frac{a+b+c}{2},\quad \text{Area} = \sqrt{s(s-a)(s-b)(s-c)}. $$

Step 1: Enter Triangle Sides

Enter the length of side a

Enter the length of side b

Enter the length of side c

Formulas used: $$ \text{Perimeter} = a + b + c, \quad s = \frac{a+b+c}{2}, \quad \text{Area} = \sqrt{s(s-a)(s-b)(s-c)}. $$