The area of the triangle can be calculated by  (1/2) × base × height. Another formula that is used to calculate the area is Heron's formula. According to it, area = \\[\\sqrt{s (s-a) (s-b) (s-c)}\\] where (s) represents = Perimeter/2 = (a + b + c)/2.  The a, b and c is the length of their sides.