how to find smallest altitude of any triangle given Share with your friends Share 1 Rishabh Mittal answered this Smallest altitude is find out by taking longest side as base.Since , Base and altitude are inversely proportional.For example:-Consider the triangle with the sides 13 , 14 and 15.Area using heron's formula:-s=13+14+152=422=21 units.Area=2121-1321-1421-15=21876=84 square unit.Area =12×base×altitude84=12×15×altitudealtitude=16815=11.20 units.Smallest altitude is 11.20 units. 1 View Full Answer Sourav Khanna answered this by taking longest side as base 0 Jvsishavrahul answered this BY TAKING ITS LONGEST SIDE AS BASE. 0