How to use the altitude of a triangle and similarity to determine missing values

The video tutorial explains the concept of similar triangles, focusing on their proportional side lengths and altitudes. It demonstrates how to set up and solve a proportion to find an unknown side length using cross multiplication. The tutorial emphasizes the relationship between similar triangles and their corresponding segments.

What is the known side length of the first triangle?

• 18

• 20

• 22

• 24

What property do similar triangles share regarding their side lengths?

• They are proportional

• They are equal

• They are parallel

• They are perpendicular

What additional property, besides side lengths, is proportional in similar triangles?

• Angles

• Areas

• Perimeters

• Altitudes

What is the first step in solving the proportion 22 is to X as 20 is to 10?

• Cross multiply

• Add the numbers

• Subtract the numbers

• Divide directly

After cross-multiplying, what operation is needed to solve for X?

• Addition

• Subtraction

• Division

• Multiplication