This geometry video tutorial provides a basic introduction into triangle proportionality theorems such as the side splitter theorem and the triangle angle bisector theorem. It explains how to set up a proportion to find the missing sides of a triangle and to solve for x and y. It also explains how to calculate the distance between parallel lines that are cut by two transversals using proportions. This geometry video 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:
https://www.youtube.com/watch?v=YiFwvAFk-xs
Similar Triangles - Enlargement Ratios:
https://www.youtube.com/watch?v=r7m424e3Kdc
Triangle Similarity - SSS, SAS, & AAA:
https://www.youtube.com/watch?v=VXlFEilh-cw
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