# Geometric Proof Teacher Resources

Find Geometric Proof lesson plans and worksheets
Showing 118 resources
20 Items in Unit
Lesson Planet Curated

#### Geometry Unit 2: Reasoning and Proof

For Teachers 9th - 12th Standards
The four lessons in the Geometry Unit 2 module are all about reasoning and proof. In the first lesson pupils watch a video introducing conditional statements and their related statements. Learners find out how to identify the hypothesis...
12 Items in Course
Lesson Planet Curated

#### Flipped Math: Geometry

For Students 9th - 12th Standards
Imagine taking a complete geometry course remotely! Eleven units make up the My Geometry course. Each unit follows the Flipped-Mastery cycle of learning, divided into two semesters. Pupils watch and take notes on a video that details the...
35 Items in Unit
Lesson Planet Curated

#### Geometry Unit 3: Parallel and Perpendicular Lines

For Teachers 9th - 12th Standards
The Geometry Unit 3: Parallel and Perpendicular Lines Unit Module contains seven lessons, each with a video, teacher reference, practice packets and solutions, and corrective assignments. In the first lesson, pupils learn eight...
24 Items in Unit
Lesson Planet Curated

#### Geometry Unit 4: Triangle Congruence

For Teachers 9th - 12th Standards
The Geometry Unit 4: Triangle Congruence unit module contains five lessons—each with a video, teacher reference, practice packets, solutions, and corrective assignments. To begin, scholars review the types of triangles, then investigate...
20 Items in Unit
Lesson Planet Curated

#### Geometry Unit 6: Similar Figures

For Teachers 9th - 12th Standards
Similar figures are the topic of Geometry Unit 6. Each of the four resources in the unit module contains a video, teacher reference, practice packets, solutions, and corrective assignments. In the first lesson, pupils learn the...
37 Items in Unit
Lesson Planet Curated

#### Geometry Unit 5: Quadrilaterals and Polygons

For Students 9th - 12th Standards
One's knowledge of angles should measure up to expectations. Scholars watch a video to learn about angles in polygons. They first see how to partition a polygon into triangles to find the sum of the interior angle measures. They then...
Handout
Lockport City School District

#### Reasons for Geometric Statement/Reason Proofs

For Students 8th - 11th Standards
Stuck trying to remember the formal language of a geometric proof? Never fear, this handout has them all ready to go. The reasons are sectioned by topic so this handy guide is ready when you are to tackle those two column proofs.
Instructional Video4:38

#### Rhombus Diagonals

For Students 9th - 10th
Delving into a proof that the diagonals of a rhombus are perpendicular to each other, this lecture evaluates the angles and sides of this figure. It would serve as a great test preparation activity.
Instructional Video15:15

#### Triangle Medians and Centroids (2D Proof)

For Students 9th - 10th
After addressing the terminology used with medians and centroids of triangles in the first part of this series, the instructor shows how to solve this type of problem. He illustrates the concepts by using a high-level problem....
Instructional Video9:00
Curated OER

#### Triangle Medians and Centroids

For Students 9th - 10th
The terminology used in geometry, including such words as centroid and median are discussed in this video. Through this lecture, young mathematicians can see a visual representation both median and centroid. Also, a proof showing how to...
Instructional Video9:00
Curated OER

#### Triangle Medians and Centroids

For Students 9th - 10th
The terminology used in geometry, including such words as centroid and median are discussed in this video. Through this lecture, young mathematicians can see a visual representation both median and centroid. Also, a proof showing how to...
Instructional Video4:36
Curated OER

#### Area of Diagonal Generated Triangles of Rectangle are Equal

For Students 9th - 10th
Finding the area of each of the triangles that are created by drawing two diagonal lines through a rectangle is explored in this lecture. It provides a detailed explanation of how to use a formula to solve the given problem. Tip: Use...
Instructional Video4:36
Curated OER

#### Area of Diagonal Generated Triangles of Rectangle are Equal

For Students 9th - 10th
Finding the area of each of the triangles that are created by drawing two diagonal lines through a rectangle is explored in this lecture. It provides a detailed explanation of how to use a formula to solve the given problem. Tip: Use...
Instructional Video11:39
Curated OER

#### Area of Inscribed Equilateral Triangle (some basic trig used)

For Students 9th - 12th
Delving into basic trigonometry, this resource shows how to find the area of an inscribed equilateral triangle. Using a high-level problem, HeronÕs theorem is used to find the area of a figure. Prior to SAT testing, use this as a review.
Activity
1
1
Curated OER

#### Geometry Project

For Students 9th - 12th Standards
Proofs are usually an intimidating assignment. An engaging lesson focused on geometric proofs may reduce the anxiety! Pupils choose between several triangle proofs to complete and work on completing them. The assignment also gives a...
Instructional Video6:57
2
2
Flipped Math

#### Unit 2 Review: Reasoning and Proofs

For Students 9th - 12th Standards
The proof is in the review. Individuals watch a short review of the content from the unit to prepare for the unit exam. The review covers inductive reasoning, conditional and related statements, and two-column algebraic and geometric...
Worksheet

#### Parallel Lines Proofs Practice

For Students 8th - 11th Standards
Here is a learning exercise that lines up perfectly with the skills needed to finish a geometric proof. Eleven problems are given to see if learners can prove that lines are parallel or angles are congruent.
Lesson Plan
1
1
Illustrative Mathematics

#### Similar Triangles

For Teachers 9th - 11th Standards
Proving triangles are similar is often an exercise in applying one of the many theorems young geometers memorize, like the AA similarity criteria. But proving that the criteria themselves are valid from basic principles is a great...
Assessment
Georgia Department of Education

#### Analytic Geometry Study Guide

For Students 9th - 12th Standards
Are you looking for a comprehensive review that addresses the Common Core standards for geometry? This is it! Instruction and practice problems built specifically for standards are included. The material includes geometry topics from...
Worksheet
Curated OER

#### Geometric Proofs

For Students 10th - 11th
In this geometric proof activity, learners use geometric theorems and rules to prove given statements. They prove that given lines and angles are similar. This five-page activity contains ten problems.
Worksheet
Curated OER

#### Geometric Proofs

For Students 10th - 11th
In this geometric proofs learning exercise, students prove supplementary, complimentary, and congruent angles from given models and information. This four-page learning exercise contains six multi-step problems.
Lesson Plan
Curated OER

For Teachers 9th - 11th
Working backwards can sometimes help you see a path to solving a problem. In this chapter, properites of quadrilaterials are proven by looking at flowcharts and working the probem backwards. Worked through examples are given, along with...
Activity
Education Development Center

#### Proof with Parallelogram Vertices

For Teachers 8th - 10th Standards
Geometric figures are perfect to use for proofs. Scholars prove conjectures about whether given points lie on a triangle and about midpoints. They use a provided dialogue among fictional students to frame their responses.
Worksheet
Curated OER

#### Geometric Proof and Angles

For Students 10th
In this geometry instructional activity, 10th graders write two-column and paragraph proofs to prove angle pair relationships.  The one page instructional activity contains five problems.  Answers are not included.