Prove theorems about similar triangles, including the triangle proportionality theorem, and apply these theorems to solve problems

How Do You Solve a Problem Using Indirect Measurement with Shadows?

Word problems allow you to see the real world uses of math! This tutorial shows you how to take a word problem and use indirect measurement to turn it into a proportion. Then see how to use the mean extremes property of proportions to cross multiply and solve for the answer. Take a look!
How Do You Use the Triangle Proportionality Theorem to Find Missing Lengths in a Diagram?

This tutorial shows you how the Triangle Proportionality Theorem can be used to find a missing length in a diagram. Take a look!
How Do You Find a Geometric Mean?

To find the geometric mean of two numbers, just find the product of those numbers and take the square root! Follow along with this tutorial to learn the process step-by-step.
What is a Geometric Mean?

The geometric mean can help you find a missing term in a geometric sequence. Before you find the geometric mean, you should understand what it is. This tutorial defines geometric mean.