<img src="https://d5nxst8fruw4z.cloudfront.net/atrk.gif?account=iA1Pi1a8Dy00ym" style="display:none" height="1" width="1" alt="" />

# Triangle Proportionality

## Sides divided by a line parallel to the third side of a triangle.

Levels are CK-12's student achievement levels.
Basic Students matched to this level have a partial mastery of prerequisite knowledge and skills fundamental for proficient work.
At Grade (Proficient) Students matched to this level have demonstrated competency over challenging subject matter, including subject matter knowledge, application of such knowledge to real-world situations, and analytical skills appropriate to subject matter.
Advanced Students matched to this level are ready for material that requires superior performance and mastery.

## Triangle Proportionality

This concept teaches students how to determine if lines in triangles are parallel and find missing lengths using the Triangle Proportionality Theorem.

0
• Video

## Triangle Proportionality Principles

This video gives more detail about the mathematical principles presented in Triangle Proportionality.

0
• Video

## Triangle Proportionality Examples

This video shows how to work step-by-step through one or more of the examples in Triangle Proportionality.

0
• Practice
0%

## Triangle Proportionality Practice

0
• Interactive Exercise

## Proportional Segment Division.

Checks your understanding of proportional figures.

0
• Interactive Exercise

## Are The Two Triangles Similar?

Checks your understanding of proportional figures.

0
• Interactive Exercise

## Which Angle Is Congruent?

Checks your understanding of proportional figures.

0
• Interactive Exercise

## Which Angle Is Congruent (part 2)?

Checks your understanding of proportional figures.

0
• Interactive Exercise

## Which Side is Proportional?

Checks your understanding of proportional triangles.

0
• Interactive Exercise

## Given Two Proportional Triangles, Solve for x

Checks your understanding of proportional triangles.

0
• Interactive Exercise

## Given SSS Similar Triangles, What is x (part 2)?

Checks your understanding of similar triangles.

0
• Critical Thinking

## Triangle Proportionality Discussion Questions

A list of student-submitted discussion questions for Triangle Proportionality.

0

To activate prior knowledge, make personal connections, reflect on key concepts, encourage critical thinking, and assess student knowledge on the topic prior to reading using a Quickwrite.

0

To stress understanding of a concept by summarizing the main idea and applying that understanding to create visual aids and generate questions and comments using a Concept Matrix.

0

## Triangle Proportionality Stop and Jot Table

Learn new vocabulary words and help remember them by coming up with your own sentences with the new words using a Stop and Jot table.

0
• Real World Application

## Triangle Proportionality

How does NASA use proportionality to test space crafts?

0
• Study Guide