## Parallel Lines problem.pdf - Section 3: Closure

Prove It (Part 1)

# Prove It (Part 1)

Unit 9: Similar and Right Triangles

Lesson 2 of 8

Lesson 2 of 8

## Objective: Students will be able to develop and prove hyptheses about angles in triangles, in preparation for the next lesson, in which they will develop a proof of the Pythagorean theorem.

Standards:

Subject(s):

Math, similar triangles, Geometry, Similarity and Congruence, triangle (Determining Measurements), proving hypotheses, right triangle, proof, altitude to the hypotenuse, hypothesis, 10th grade

*45 minutes*

3

#### Closure

*5 min*

With about five minutes to go, I ask the students to stop working and I let them know that I’d like each group to report out on their progress with the Parallel Lines problem.

- I ask to hear first from any groups who are not yet finished:
- What is their hypothesis?
- Where are they in the problem solving process?
- Are they having any particular issues? If so, with what?
- From groups who have finished, I ask for one observation from each group:
- Did they struggle with anything in particular?
- What did they find challenging?
- Did they find these tasks difficult or easy, and why?

#### Resources

*expand content*

Feedback (1)

Give Beth some feedback on this lesson

BetterLesson Community Feedback

Amanda Curtis:

This is my FAVORITE LESSON EVER! I wish I could have video-taped my class doing these exercises. How fun! Thank you, thank you, thank you!

Cheers,

Amanda Curtis in Butte, MT

| 3 years ago | ReplyNo comments at this time. Add yours above.

##### Similar Lessons

###### Reasoning About Rigid Motions

Geometry » Congruence and Rigid Motions

Big Idea:
Students learn how to use reason as well as experience to understand the result of transforming a figure. Deductive and inductive logic work hand-in-hand!

*Favorites(1)*

*Resources(18)*

Ault, CO

Environment: Rural

Environment: Rural

###### Proving It

Geometry » Line-sanity!

Big Idea:
This lesson begins to builds students understanding of proofs using Algebra and Geometry.

*Favorites(8)*

*Resources(25)*

Saratoga Springs, NY

Environment: Suburban

Environment: Suburban

###### Parallel Lines Challenge Problem

8th Grade Math » Transformations

Big Idea:
Challenge students to prove what they know about parallel lines and angle relationships when the diagram is unique and exact angle measures irrelevant.

*Favorites(4)*

*Resources(12)*

Bowling Green, KY

Environment: Suburban

Environment: Suburban

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