Find the third side of isosceles and scalene triangle Share with your friends Share 1 Abhishek Jha answered this Your question is not clear and appears to be incomplete. Kindly post your complete query so that we can provide you with some meaningful help. 0 View Full Answer Harsh Agarwal answered this just add the 2 sides angles and subtract it from 180 and you will find the third side do the same for both of the triangles. 1