Completion requirements
Similar triangles don't only look very much alike, but they also have a unique relationship between the length of their sides. This lecture series describes the properties of similar triangles. Watch the videos and complete the interactive exercises.
Intro to triangle similarity
Source: Khan Academy, https://www.khanacademy.org/math/geometry-home/similarity This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 License.