This math video tutorial discusses similar triangles and how to use proportions to find the missing side and solve for x. This video contains plenty of examples and practice problems.

Polygons:    • Polygons  

Quadrilaterals:
   • Quadrilaterals - Geometry  

Skew Lines:
   • Skew Lines, Perpendicular & Parallel ...  

Points, Lines, Planes, & Segments:
   • Points, Lines, Planes, Segments, & Ra...  

Triangles - Basic Introduction:
   • Triangles - Basic Introduction, Geometry  

Number of a Diagonals In a Polygon:
   • Number of Diagonals In a Regular Poly...  

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Ratios and Proportions - Means Extreme:
   • Ratios and Proportions, Arithmetic & ...  

Similar Triangles:
   • Similar Triangles  

Similar Triangles - Enlargement Ratios:
   • Similar Triangles and Figures, Enlarg...  

Triangle Similarity - SSS, SAS, & AAA:
   • Triangle Similarity - AA SSS SAS & AA...  

Triangle Proportionality Theorem:
   • Triangle Proportionality Theorem, Sid...  

Altitude on Hypotenuse Theorem:
   • Altitude on Hypotenuse Theorem - Geom...  

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Pythagorean Theorem:
   • Pythagorean Theorem  

The Distance Formula:
   • Distance Formula  

Distance Between 2 Points - 3D:
   • How To Find The Distance Between 2 Po...  

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