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
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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
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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