The sides of a triangle are a = 35 cm, b = 54 cm and c = 61 cm

Now, perimeter a + b + c = 25

⇒ S = 1/2 (35 + 54 + 61)

⇒ s = 75 cm

By using heron’s formula

The altitude will be a smallest when the side corresponding to it is longest Here, longest side is 61 cm.

Hence the length of the smallest altitude is 30.79 m