Triangle Sum Theorem and Exterior Angle Theorem Foldable - Fully Editable

What others say

"My students loved this, and they loved that it is easy and ready for them to use. We used bright colors so they could find i,t and it has become a daily resource for them."

Kelly T.

" Used this resource in place of the instructional pages in book as this resource gives students the ability to learn the skills through practicing, rather than through reading a worked out example. Ample space provided for showing work as well. Great reference for students to review."

Mandy R.

Description

This editable pre-algebra foldable organizes the following angle theorems for triangles:

Triangle Sum Theorem
Exterior Angle Theorem

It serves as a great introduction to the lesson during guided instruction, centers activity, intervention group, a class work assignment, or even a homework assignment.

A detailed answer key is included!

This foldable is also included in my:

★ 8th Grade Math/ Pre-Algebra Foldable + Activity Bundle

★ High School Geometry Foldable Bundle

If you're looking for digital (and print) assignments to complement my foldables, check out my:

★ Pre-Algebra Google Forms Assignment Bundle

You may also be interested in some of my foldable bundles:

★ 5th Grade Math Foldable + Activity Bundle

★ 6th Grade Math Foldable + Activity Bundle

★ 7th Grade Math Foldable + Activity Bundle

★ Algebra 1 (+Pre-Algebra) Foldable Bundle

★ High School Geometry Foldable + Activity Bundle

★ Algebra 2 Foldable Bundle

You may be interested in some of my Google Forms Digital Assignment Bundles:

★ 6th Grade Math

★ 7th Grade Math

★ Algebra 1 Semester 1 / Algebra 1 Semester 2

★ High School Geometry

★ Algebra 2

Feel free to email me with requests, questions, or feedback at Lisa@LisaDavenportOnTPT.com!

Report this resource to TPT

Reported resources will be reviewed by our team. Report this resource to let us know if this resource violates TPT's content guidelines.

Triangle Sum Theorem and Exterior Angle Theorem Foldable - Fully Editable

Name: Triangle Sum Theorem and Exterior Angle Theorem Foldable - Fully Editable
Brand: Lisa Davenport
SKU: 1795847
Price: 3.00 USD
Availability: InStock
Rating: 4.91 (179 reviews)

Lisa Davenport

7.9k Followers

$3.00

Highlights

Grades

8th

Subjects

Geometry, Math

Standards

CCSS8.G.A.5

What others say

"My students loved this, and they loved that it is easy and ready for them to use. We used bright colors so they could find i,t and it has become a daily resource for them."

Kelly T.

Mandy R.

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Description

This editable pre-algebra foldable organizes the following angle theorems for triangles:

Triangle Sum Theorem
Exterior Angle Theorem

It serves as a great introduction to the lesson during guided instruction, centers activity, intervention group, a class work assignment, or even a homework assignment.

A detailed answer key is included!

This foldable is also included in my:

★ 8th Grade Math/ Pre-Algebra Foldable + Activity Bundle

★ High School Geometry Foldable Bundle

If you're looking for digital (and print) assignments to complement my foldables, check out my:

★ Pre-Algebra Google Forms Assignment Bundle

You may also be interested in some of my foldable bundles:

★ 5th Grade Math Foldable + Activity Bundle

★ 6th Grade Math Foldable + Activity Bundle

★ 7th Grade Math Foldable + Activity Bundle

★ Algebra 1 (+Pre-Algebra) Foldable Bundle

★ High School Geometry Foldable + Activity Bundle

★ Algebra 2 Foldable Bundle

You may be interested in some of my Google Forms Digital Assignment Bundles:

★ 6th Grade Math

★ 7th Grade Math

★ Algebra 1 Semester 1 / Algebra 1 Semester 2

★ High School Geometry

★ Algebra 2

Feel free to email me with requests, questions, or feedback at Lisa@LisaDavenportOnTPT.com!

Report this resource to TPT

Reported resources will be reviewed by our team. Report this resource to let us know if this resource violates TPT's content guidelines.

4.9

Rated 4.91 out of 5, based on 179 reviews

179
ratings

168

Mostly used with 8th and 10th grades

Reviews

7th

8th

9th

10th

11th

12th

All verified TPT purchases

A wonderful resource.

Rated 5 out of 5

September 14, 2025

Met expectations

Great value

Standards-aligned

My students loved this, and they loved that it is easy and ready for them to use. We used bright colors so they could find i,t and it has become a daily resource for them.

Kelly T.

107 reviews • Georgia

Grades taught: 10th

Rated 5 out of 5

April 10, 2025

Used this resource in place of the instructional pages in book as this resource gives students the ability to learn the skills through practicing, rather than through reading a worked out example. Ample space provided for showing work as well. Great reference for students to review.

Mandy R.

41 reviews

Grades taught: 8th

Rated 5 out of 5

March 17, 2025

This is an easy resource to use. My students enjoy it and they are engaged the entire time.

Staci M.

196 reviews

Grades taught: 8th, 9th, 10th

Student populations: Learning difficulties

Rated 5 out of 5

October 2, 2024

This is a great resource for my Geometry class. Thank you!

Jessica M.

835 reviews

Grades taught: 10th

Rated 5 out of 5

August 4, 2024

The triangle thereoms were hard to understand for my students but this foldable made so easy! Everything was in one spot and concise.

Jodie R.

322 reviews

Grades taught: 7th

Rated 5 out of 5

July 29, 2024

It’s a great resource and I was able to tweak it to work with my special education students. Thank you so much!

Tonya R.

984 reviews

Rated 5 out of 5

March 8, 2023

This is a great foldable. I love using them and my students seem to like using them as it is different then just taking straight notes.

Kelly R.

190 reviews

Grades taught: 8th

Response from

Lisa Davenport

(TPT Seller)

Mar 8, 2023

Thank you!!!

Rated 5 out of 5

February 12, 2023

Loved this foldable to teach angle theorems with my honors 7th graders.

Katrina O'Bryan

(TPT Seller)

32 reviews

Grades taught: 7th

Questions & Answers

Standards

to see state-specific standards (only available in the US).

CCSS8.G.A.5

Use informal arguments to establish facts about the angle sum and exterior angle of triangles, about the angles created when parallel lines are cut by a transversal, and the angle-angle criterion for similarity of triangles. For example, arrange three copies of the same triangle so that the sum of the three angles appears to form a line, and give an argument in terms of transversals why this is so.