This geometry video tutorial provides a basic introduction on similar triangles and similar figures. It explains how to find the missing side using the proportions of similar triangles and even similar trapezoids. It explains how to solve for x as it relates to missing sides and missing angles. It discusses how to calculate the enlargement ratio and how to use it to determine the perimeter area of another triangle. This tutorial contains plenty of examples and practice problems. Polygons: https://www.youtube.com/watch?v=E_-3ulbtcLk Quadrilaterals: https://www.youtube.com/watch?v=ogcH3eM5beM Skew Lines: https://www.youtube.com/watch?v=cemF45vNOhg Points, Lines, Planes, & Segments: https://www.youtube.com/watch?v=dDWjhRfBsKM Triangles - Basic Introduction: https://www.youtube.com/watch?v=q7vI2oXL0gQ Number of a Diagonals In a Polygon: https://www.youtube.com/watch?v=jZYL2TUrYSw ___________________________________ Ratios and Proportions - Means Extreme: https://www.youtube.com/watch?v=tFCrFa0mDi4 Similar Triangles - Enlargement Ratios: https://www.youtube.com/watch?v=r7m424e3Kdc Triangle Similarity - SSS, SAS, & AAA: https://www.youtube.com/watch?v=VXlFEilh-cw Triangle Proportionality Theorem: https://www.youtube.com/watch?v=EQpguitDfGU Altitude on Hypotenuse Theorem: https://www.youtube.com/watch?v=RiTp3vyWe0o ___________________________________ Pythagorean Theorem: https://www.youtube.com/watch?v=d8EA5TxGzcY The Distance Formula: https://www.youtube.com/watch?v=YDvUy5VYm9E Distance Between 2 Points - 3D: https://www.youtube.com/watch?v=0c6cP2zLC2c Final Exams and Video Playlists: https://www.video-tutor.net/ Full-Length Videos and Worksheets: https://www.patreon.com/MathScienceTutor/collections