Khan Academy
Khan Academy: Ca Geometry: Triangles and Parallelograms
Worked examples of triangles and parallelograms.
Khan Academy
Khan Academy: Ca Geometry: More on Congruent and Similar Triangles
Worked examples of similar and congruent triangles.
Khan Academy
Khan Academy: Triangle Similarity & the Trigonometric Ratios
Sal explains how the trigonometric ratios are derived from triangle similarity considerations.
Khan Academy
Khan Academy: Geometry Word Problem: A Perfect Pool Shot
Sal uses triangle similarity to plan the perfect shot in a pool game.
Sophia Learning
Sophia: Equilateral Triangles: Lesson 5
This lesson will prepare you to distinguish an equilateral triangle based on the sides of a triangle. It is 5 of 8 in the series titled "Equilateral Triangles."
Sophia Learning
Sophia: Finding the Area of an Sas Triangle: Lesson 5
Finding the are of an SAS triangle is demonstrated in this lesson. It is 5 of 7 in the series titled "Finding the Area of an SAS Triangle."
Sophia Learning
Sophia: Triangle Notation: Lesson 2
Following this lesson, you'll be able to name a triangle based on the three vertices and the triangle symbol. It is 2 of 6 in the series titled "Triangle Notation."
Sophia Learning
Sophia: Solving Height or Base of a Triangle Given Its Area #6
This lesson will provide practice solving the unknown height or base length of a triangle when given its area.