## Rectangle Diagrams.docx.doc.pdf - Section 2: Proving that These Triangles are 30, 60, 90 Triangles

30, 60, 90 Triangles

# 30, 60, 90 Triangles

Unit 9: Similar and Right Triangles

Lesson 6 of 8

Lesson 6 of 8

## Objective: Students will be able to become familiar with the ratios of the sides of 30, 60, 90 triangles.

Subject(s):

Math, similar triangles, Geometry, Similarity and Congruence, triangle (Determining Measurements), right triangle, Pythagorean Theorem, special right triangles, proof, 10th grade

*45 minutes*

3

#### Applying the Pattern

*10 min*

I ask that the students turn to the back of the Rectangle Diagrams handout. These problems and the accompanying questions help to pull together and summarize the topic of the 30-60-90 Right Triangle.

*expand content*

Feedback (0)

Give Beth some feedback on this lesson

BetterLesson Community Feedback

No comments at this time. Add yours above.

##### Similar Lessons

###### Dilation and Similarity Unit Test

Geometry » Scaling Up- Dilations, Similarity and Proportional Relationships

Big Idea:
Students will show what they know!

HSG-SRT.A
HSG-SRT.B.5

*Favorites(2)*

*Resources(20)*

Ault, CO

Environment: Rural

Environment: Rural

###### SAS-sy Triangles

Geometry » Tremendous Triangles

Big Idea:
In this student-centered lesson, students will explore and explain why the SAS congruence theorem works to prove triangles congruent.

*Favorites(4)*

*Resources(35)*

Saratoga Springs, NY

Environment: Suburban

Environment: Suburban

###### Similar Triangles and the Flatiron Building

Geometry » Similarity in Triangles

Big Idea:
The Flatiron Building located in New York City is one of the most iconic buildings in the country. Its unique triangular shape makes it a great subject for mathematical investigations.

*Favorites(3)*

*Resources(17)*

New York, NY

Environment: Urban

Environment: Urban

Scroll Up

- LESSON 1: Introduction to Similar Right Triangles
- LESSON 2: Prove It (Part 1)
- LESSON 3: Prove It (Part 2)
- LESSON 4: Using the Pythagorean Theorem
- LESSON 5: Special Right Triangles
- LESSON 6: 30, 60, 90 Triangles
- LESSON 7: Isosceles Right Triangles
- LESSON 8: Special Right Triangles Puzzle Activity

Scroll Down