Lesson Plan
Curated OER

#### Euclidean Direct Proofs

For Teachers 9th - 10th
Learning how to prove theorems in geometry can be challenging. This resource explains what a proof is, and the different styles for proofs. It also contains links to web-based practice problems that help guide learners though example...
Lesson Plan
Curated OER

#### Paragraph Proofs

For Teachers 9th - 12th
Students explore the concept of paragraph proofs. In this paragraph proofs lesson, students make flow charts of the process of getting ready for school. Students convert the flow chart to a paragraph proof. Students use geometric...
Worksheet
Curated OER

#### Proofs Of The Pythagorean Theorem?

For Students 8th Standards
Even U.S. President James Garfield had his own proof of the Pythagorean Theorem! Pupils consider three different attempts at a geometric proof of the Pythagorean Theorem. They then select the best proof and write paragraphs detailing...
Worksheet
Curated OER

#### Proofs

For Students 8th - 11th
In this geometric proof worksheet, students compose 20 triangle congruency proofs. Students will decide if there is enough information in problems 1-6 to prove if any triangles are congruent. In problems 17 to 20, students use given...
Unit Plan
Mathematics Vision Project

#### Geometric Figures

For Teachers 10th - 12th Standards
Logical thinking is at the forefront of this jam-packed lesson, with young mathematicians not only investigating geometric concepts but also how they "know what they know". Through each activity and worksheet, learners wrestle with...
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.
Lesson Plan
EngageNY

#### The Painted Essay for Opinion Writing: Writing Proof Paragraphs

For Teachers 5th Standards
It's time to proof read! Pupils read and analyze proof paragraphs from a model essay. They then practice writing their own proof paragraphs to express an opinion about offshore oil drilling.
Lesson Plan
EngageNY

#### The Painted Essay: Writing Proof Paragraphs

For Teachers 5th Standards
Words of proof. Learners continue coding The Electric Motor by marking the first point in yellow and the second point in blue. They discuss the structure of the paragraphs by identifying transition words and evidence to support the given...
Lesson Plan
1
1
Illustrative Mathematics

#### Right Triangles Inscribed in Circles I

For Teachers 9th - 10th Standards
One of the basic properties of inscribed angles gets a triangle proof treatment in a short but detailed exercise. Leading directions take the learner through identifying characteristics of a circle and how they relate to angles and...
Lesson Plan
EngageNY

#### Comparing the Ratio Method with the Parallel Method

For Students 9th - 10th Standards
Can you prove it? Lead your class through the development of the Side Splitter Theorem through proofs. Individuals connect the ratio and parallel method of dilation through an exploration of two proofs. After completing the proofs,...
Lesson Plan
2
2
Illustrative Mathematics

#### Are They Similar?

For Teachers 9th - 11th Standards
Learners separate things that just appear similar from those that are actually similar. A diagram of triangles is given, and then a variety of geometric characteristics changed and the similarity of the triangles analyzed. Because the...
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...
Unit Plan
Mathematics Vision Project

#### Module 6: Congruence, Construction, and Proof

For Teachers 8th - 10th Standards
Trace the links between a variety of math concepts in this far-reaching unit. Ideas that seem very different on the outset (like the distance formula and rigid transformations) come together in very natural and logical ways. This unit...
Worksheet
Curated OER

#### Inscribed Angles

For Students 10th
In this inscribed angles activity, 10th graders solve 13 various types of problems related to inscribed angles in geometry. First, they identify a circle illustrated and each arc of the circle. They, students find the measure of each...
Worksheet
Curated OER

#### More Congruent Triangles

For Students 10th
In this congruent triangles worksheet, 10th graders solve 5 various types of geometry problems related to triangles. First, they draw and label triangles, indicating the additional pairs of corresponding parts that would have to be...
Lesson Plan
Curated OER

#### Pythagorean Theorem Proof

For Teachers 10th
Tenth graders investigate the Pythagorean Theorem. Then they type up a formal paragraph proof of a proof of their choice.
Organizer
Curated OER

#### Thesis-Proof Graphic Organizer

For Students 4th - 8th
In this thesis-proof graphic organizer worksheet, students fill in a thesis, and the supporting and refuting evidence. They write a conclusion paragraph on the lines provided below the organizer.
Lesson Plan
EngageNY

#### The Painted Essay for Opinion Writing: Developing a Conclusion and Adding Linking Words

For Teachers 5th Standards
Let's get colorful! Scholars use the Painted Essay technique to analyze and color code the conclusion of a model essay. Working in small groups, pupils then write a conclusion paragraph for their draft editorials about offshore drilling.
Lesson Plan
Illustrative Mathematics

#### Joining Two Midpoints of Sides of a Triangle

For Teachers 9th - 11th Standards
Without ever using the actual term, this exercise has the learner develop the key properties of the midsegment of a triangle. This task leads the class to discover a proof of similar triangles using the properties of parallel lines cut...
Lesson Plan
Curated OER

#### Geometry, Measurement & Reasoning

For Teachers 9th - 11th
Students construct two-column proofs. In this geometry lesson, students use deductive reasoning and geometric properties to justify given geometric statements. Students compare and contrast proofs.
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...
Lesson Plan
Curated OER

For Teachers 6th - 8th
Lesson Plan
Virginia Department of Education

#### Pythagorean Theorem

For Students 8th Standards
Investigate the meaning of the Pythagorean Theorem through modeling. After comparing the area of the square of each side, individuals cut triangles and squares to facilitate the comparison.
Organizer
Curated OER

#### Getting to Know Characters

For Students 8th
This set of worksheets constitutes enough work and materials to be considered a lesson. They guide readers through a process of exploring characters and their motivations, and writing a paragraph about them. Here are seven handouts that...