McGraw Hill
Triangles
After reviewing characteristics of seven types of triangles, young geometers discover how to find the missing angle of a triangle. Then, they practice identifying triangles, find missing angles, and find missing side lengths of...
Curated OER
Developing Strategies for Addition and Subtraction
Primary graders develop strategies to assist them with addition and subtraction. They discover number combinations and numerical facts which enable them to add and subtract more effectively. Young scholars use these techniques to...
Illustrative Mathematics
Same Base and Height, Variation 2
This is a good model for learners to visualize triangles of the same base and height. They can can begin to comprehend that these triangles will have the same area no matter how the triangle is drawn. It is part of a series of resources...
Curated OER
Triangle Congruence with Coordinate
Two triangles are displayed on a coordinate plane. Youngsters apply a reflection and a translation to demonstrate their congruence. This exercise makes a terrific tool for teaching these concepts, or a way to assess learning.
Curated OER
Reflecting Reflections
A triangle rests in quadrant two, from which your class members must draw reflections, both over x=2 and x=-2. This focused exercise strengthens students' skills when it comes to reflection on the coordinate plane.
Curated OER
Reflections and Equilateral Triangles
Your learners collaboratively find the lines of symmetry in an equilateral triangle using rigid transformations and symmetry. Through congruence proofs they show that they understand congruence in terms of rigid motions as they...
Curated OER
When Does SSA Work to Determine Triangle Congruence?
Your learners will make good use of the Socratic method in a collaborative task that begins with an assumed solution and ends with deeper understanding of the idea of determining two triangles congruent.
Curated OER
Why Does SAS Work?
Your geometry learners are guided by questions that help them use the language of reflections to explain the Side-Angle-Side congruence between two triangles in this collaborative task. Given a sample solution, declaring the...
Illustrative Mathematics
Right Triangles Inscribed in Circles II
So many times the characteristics of triangles are presented as a vocabulary-type of lesson, but in this activity they are key to unraveling a proof. A unique attack on proving that an inscribed angle that subtends a diameter must be a...
Illustrative Mathematics
Why Does SSS Work?
While it may seem incredibly obvious to the geometry student that congruent sides make congruent triangles, the proving of this by definition actually takes a bit of work. This exercise steps the class through this kind of proof by...
Illustrative Mathematics
Joining Two Midpoints of Sides of a Triangle
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...
West Contra Costa Unified School District
Arcs and Angles
Noah didn't construct this kind of arc. High school scholars first explore how angles can be formed in circles. They then learn relationships between angles and arcs by conducting an exploratory activity where they position and draw arcs...
West Contra Costa Unified School District
Investigating Special Right Triangles
Scholars first investigate relationships in the side lengths of 30°-60°-90° triangles and 45°-45°-90° triangles. This knowledge then helps them solve problems later in the lesson about special right triangles.
Mathed Up!
Angles in Triangles and Quadrilaterals
This short video show viewers how to connect the sum of the angles in a triangle to other angle measurements. Pupils determine the missing measures for angles involved with triangles and quadrilaterals. Class members then must explain...
National Council of Teachers of English
Acrostic Poems: All About Me and My Favorite Things
Budding poets create two acrostic poems, one for their name and another using a word of their choice. Over the course of five days, scholars compose, revise, publish, and share their work with their peers.
Curated OER
Quilting
Students use a monochromatic palate, select shades and tints for a selected hue, or select complimentary or analogous colors for a quilt design. They design quilt squares using basic geometric shapes, repetition, balance, and proportion.
Curated OER
My Alphabetical Autobiography
Design a pictorial autobiography using the letters of the alphabet. For each letter, writers select visual images that represent life events and interests. Younger writers add words or sentences of explanation while older writers narrate...
Curated OER
The "Wright" Puzzle
A crossword puzzle based on the lives of the Wright brothers. Students research on their own or in small groups several brief biographies of the Wright brothers.They complete a crossword puzzle based on their reading.
Curated OER
Science: Teddy Bear Nation
Students sort teddy bears according to types and then graph the results. They each bring a bear to class and then discuss their similarities and differences. Once the bears have been sorted into groups according to size and color,...
Curated OER
Totally Awesome Answers to Wacky Wonders
Middle schoolers work with a partner to gather information on a question from two sources using a computer program and the Internet. They also write a report with visuals to air on closed-circuit TV for the school. Use this lesson to...
Curated OER
Multiplication and Division 1
Third and fourth graders read word problems, determine the operation to solve, and solve the problems. Theysolve five problems. A good resource.
Curated OER
Rays and Angles - Homework 16.2
Learners name seven different angles in three different ways and then classify each angle as acute, obtuse, right or straight. They solve one word problem.
Curated OER
Lesson: Urs Fischer: Reviving the Past Art Movements
Seven major abstract art movements are analyzed by learners in groups. Each group analyzes various works by determining which work belongs to which movement. They then read Flatland, engage in an art and literary analysis discussion,...
Curated OER
See It, Say It, Move It, Do It!
Learn two new letters a week with this activity! After learning the two target letters, the class will make an alphabet video "performing" each letter. The letter's name, sound, and a motion associated with it will be included in the...
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