# Prove the Pythagorean Theorem Using Similarity

##### This Prove the Pythagorean Theorem Using Similarity lesson plan also includes:

Amaze your classes with the ability to find side lengths of triangles immediately — they'll all want to know your trick! Learners use the Pythagorean Theorem and special right triangle relationships to find missing side lengths.

CCSS: Designed

##### Instructional Ideas

• Begin with several right triangles with known side lengths; have pupils find the relationship between the three sides of the right triangle and verify it is true for all triangles given
• Instruct individuals to record the relationships discussed in a table for quick reference
##### Classroom Considerations

• Allow time for practice with the Pythagorean Theorem and special right triangles
• A continuation of the previous lesson in a 36-part series
##### Pros

• Emphasizes similarity when exploring special right triangle relationships
• Discusses the proof of the Pythagorean Theorem and develops it directly from content in a previous lesson
##### Cons

• There is a shortage of practice within the lesson for the new concepts