▶ SUBSCRIBE HAPPY LEARNING! http://bit.ly/HappyLearningTV Educational Videos and songs for Kids. Today we’re going to learn about triangles. Triangles are polygons with three sides... See?.. One, two, three... But ... There are different kinds of triangles, and we classify them by the length of their sides. Using this classification, we get three types of triangles: isosceles, equilateral and scalene. In Equilateral triangles, all the sides are the same length... Can you see how it is forme