<https://ventureitch.com/proving-triangles-similar-worksheet/proving-triangles-similar-worksheet-100-similar-triangles-proportions-worksheet/#itempage>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://ventureitch.com/proving-triangles-similar-worksheet/proving-triangles-similar-worksheet-100-similar-triangles-proportions-worksheet/>