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- HSG-SRT.B.4Prove theorems about triangles. Theorems include: a line parallel to one side of a triangle divides the other two proportionally, and conversely; the Pythagorean Theorem proved using triangle similarity.
- HSG-SRT.B.5Use congruence and similarity criteria for triangles to solve problems and to prove relationships in geometric figures.

Special Right Triangles Puzzle Activity

Geometry

» Unit:

Similar and Right Triangles

Big Idea:Putting together puzzles is an engaging way for students to review their knowledge of special right triangles.

Beth Menzie

Urban Env.

11 Resources

64 Favorites

11 Resources

64 Favorites

Similar Figures Activity

Geometry

» Unit:

Similar Figures

Big Idea:Students move about the room, seeking their partner in similarity and calculating missing values.

Beth Menzie

Urban Env.

13 Resources

22 Favorites

13 Resources

22 Favorites

The Rope Stretcher

Geometry

» Unit:

Area Relationships

Big Idea:Students apply the Pythagorean Theorem and criteria for triangle congruence in a proof...and learn how the ancient pyramids of Egypt were laid out.

Tom Chandler

Rural Env.

26 Resources

11 Favorites

26 Resources

11 Favorites

Create Your Own Similar Figures

Geometry

» Unit:

Similar Figures

Big Idea:Students create and investigate their own concave similar polygons.

Beth Menzie

Urban Env.

15 Resources

8 Favorites

15 Resources

8 Favorites

Error Analysis: Finding Sides of Similar Triangles

Geometry

» Unit:

Similar Figures

Big Idea:Student examine common errors made in setting up and solving for missing sides of similar triangles.

Beth Menzie

Urban Env.

10 Resources

13 Favorites

10 Resources

13 Favorites

CPCTC

Geometry

» Unit:

Proofs about Triangles

Big Idea:Students will use their knowledge of the ASA, SAS and SSS postulates to prove corresponding parts of congruent triangles are congruent.

Marisa Laks

Urban Env.

14 Resources

7 Favorites

14 Resources

7 Favorites

Dilation and Similarity Unit Test

Geometry

» Unit:

Scaling Up- Dilations, Similarity and Proportional Relationships

Big Idea:Students will show what they know!

Tom Chandler

Rural Env.

20 Resources

3 Favorites

20 Resources

3 Favorites

Building a Kicker Ramp

Geometry

» Unit:

Introduction to Trigonometry

Big Idea:Students are introduced to trigonometry as they use the properties of similar right triangles to evaluate a design for a skateboard ramp.

Tom Chandler

Rural Env.

26 Resources

20 Favorites

26 Resources

20 Favorites

Introduction to Similar Right Triangles

Geometry

» Unit:

Similar and Right Triangles

Big Idea:Students investigate the three similar right triangles created by the altitude to the hypotenuse of a right triangle.

Beth Menzie

Urban Env.

19 Resources

9 Favorites

19 Resources

9 Favorites

Finding Missing Sides of Similar Triangles

Geometry

» Unit:

Similarity in Triangles

Big Idea:Students will use the criteria for similarity to find the measures of missing sides of a triangle.

Marisa Laks

Urban Env.

17 Resources

6 Favorites

17 Resources

6 Favorites

AAS and ASA Fun

Geometry

» Unit:

Tremendous Triangles

Big Idea:Students will work with a partner to discover two more theorems as they explore why ASA and AAS congruence proves triangles are congruent.

Stephanie Conklin

Suburban Env.

22 Resources

4 Favorites

22 Resources

4 Favorites

Working with Similar Triangles

Geometry

» Unit:

Similar Figures

Big Idea:Similar or not similar? That is the question!

Beth Menzie

Urban Env.

9 Resources

8 Favorites

9 Resources

8 Favorites

Using the Pythagorean Theorem

Geometry

» Unit:

Similar and Right Triangles

Big Idea:Students practice finding lengths of segments using the Pythagorean Theorem, with an eye toward discovering common Pythagorean triplets.

Beth Menzie

Urban Env.

10 Resources

7 Favorites

10 Resources

7 Favorites

Similar Triangles and the Flatiron Building

Geometry

» Unit:

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.

Marisa Laks

Urban Env.

17 Resources

4 Favorites

17 Resources

4 Favorites

SAS-sy Triangles

Geometry

» Unit:

Tremendous Triangles

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

Stephanie Conklin

Suburban Env.

35 Resources

5 Favorites

35 Resources

5 Favorites

HSG-SRT.B.4

Prove theorems about triangles. Theorems include: a line parallel to one side of a triangle divides the other two proportionally, and conversely; the Pythagorean Theorem proved using triangle similarity.

HSG-SRT.B.5

Use congruence and similarity criteria for triangles to solve problems and to prove relationships in geometric figures.