Triangle Teacher Resources
Find Triangle educational ideas and activities
Showing 1 - 20 of 8,857 resources
While the lesson focuses on right triangles, this activity offers a great way to practice the area of all triangles through an interactive webpage. The activity begins with the class taking a square paper and cutting in in half; can they relate the area of the square to the right triangles?
6th - 9th Math 12 Views 12 Downloads CCSS: Adaptable
New Review Frog Garden Party! Toads and Triangles in the Math Garden
It's frog party time! With frog banners, frog juice, and a triangle hunt, your garden party is sure to be both entertaining and educational. The lesson plan connects geometry, earth science, and delicious snacks to teach kids about ecosystems and math.
4th Math 37 Views 17 Downloads CCSS: Designed
Lines of Symmetry for Triangles
What can symmetry tell us about triangles? After looking at four examples, learners will come to realize that lines of symmetry are different for equilateral, isosceles, and scalene triangles. Use this guided practice activity as an introduction to classifying triangles based on their side lengths.
3rd - 5th Math 22 Views 17 Downloads CCSS: Designed
Are These Right?
Is that a right triangle or a wrong triangle? Young mathematicians look at eleven different shapes and use a measuring tool of their choice to determine which triangles have right angles. Consider cutting out sets of the shapes to provided to learners who request them.
3rd - 5th Math 23 Views 26 Downloads CCSS: Designed
Proofs into Practice: The Pythagorean Theorem in the Real World
As an introduction to the lesson, learners verify the Pythagorean theorem with a hands-on proof. Then, pupils use the theorem to determine whether three side lengths could form a right triangle and choose one of two real-life situations to examine using the theorem.
8th - 12th Math 147 Views 215 Downloads CCSS: Designed
Theorems of Triangles
Show your school spirit while proving theorems about triangles! Your student geometers are charged with coming up with a new design for the school pennant, following specific guidelines. Along the way, they need to prove the theorem that base angles of an isosceles triangle are congruent.
9th - 11th Math 52 Views 102 Downloads CCSS: Designed
Verifying Triangles are Congruent
Here the focus is on triangle congruence. Through an activity that requires investigation, questioning, and working together, geometers learn to identify corresponding parts of triangles to determine if the triangles are congruent. Triangles are transformed through reflection, rotation, and translation.
9th - 11th Math 35 Views 65 Downloads CCSS: Designed
Mathematics Within: Slope and Triangles
Learners discover a method for determining the slope of a line by creating and comparing similar triangles. They fold coordinate grids to make three similar triangles then measure the sides to compare the relationships between the triangles.
8th - 10th Math 30 Views 94 Downloads CCSS: Adaptable
Find the Area of a Right Triangle
Help your class develop a greater understanding of the area of a right triangle. The video starts by reviewing the area of a rectangle and noting that the rectangle is made up of two congruent triangles. Learners are then shown that in order to find the area of a right triangle, you must first find the area of the rectangle created by the original triangle and a congruent triangle.
4 mins 5th - 7th Math 9 Views 6 Downloads CCSS: Designed
Study Jams! Area of a Triangle
Even though there is a wide variety of different triangles in the world, knowing a single equation allows us to find the area of each and every one of them. Follow along with this step-by-step presentation as Zoe clearly models how to use the base and height of a triangle to calculate its area.
4th - 6th Math 4 Views 4 Downloads CCSS: Adaptable
Finding the Area of an Equilateral Triangle
The problem seems simple: find the area of the equilateral triangle whose sides are each length 1. In fact, this same problem is solved in 8th grade, addressing a different Common Core standard, using the formula for area of a triangle to solve.
9th - 11th Math 13 Views 9 Downloads CCSS: Designed
New Review Classifying Triangles
Building on young mathematicians' prior knowledge of three-sided shapes, this lesson series explores the defining characteristics of different types of triangles. Starting with a shared reading of the children's book The Greedy Triangle, children go on to create triangles using geoboards and flexible straws, complete a series of worksheets, and, finally, demonstrate their learning on a short quiz.
4th - 8th Math 17 Views 11 Downloads CCSS: Adaptable
New Review Classifying Triangles
Young mathematicians explore the world of three-sided shapes in this lesson on the different types of triangles. Starting with a general introduction to classification using Venn diagrams, children learn how to categorize triangles based on the lengths of their sides and size of their angles.
4th - 8th Math 24 Views 2 Downloads CCSS: Adaptable
New Review Alice in Fractalland
Take your class on a field trip to Fractalland where they'll learn all about number and shape patterns. Based on Disney's movie Alice in Wonderland, this resource takes young mathematicians on an adventure as they explore patterns in math including Pascal's Triangle, the Fibonacci Sequence, Mandelbrot's fractals and much more.
4th - 8th Math 10 Views 9 Downloads CCSS: Adaptable
New Review Writing Task 6.G.3 Item 2
Donnie and Steward each created triangles on a coordinate plane and want to know if they have the same area. Young mathematicians use their ability to plot ordered pairs and find the area of triangles to help answer this question, providing a brief written response explaining their reasoning.
5th - 6th Math 3 Views 0 Downloads CCSS: Designed
Discovering the Formula for the Area of a Triangle
Most high schoolers are very familiar with the area of the triangle being equal to 1/2 base times the height. Here, they will develop and test their formula for the area of a triangle when given two adjacent sides and the included angle. After they develop their formula, they will use a dynamic geometry software system, such as Geometer's Sketchpad or GeoGebra to test their conjecture.
9th - 11th Math 26 Views 38 Downloads CCSS: Designed
Base and Height
It is easy to find the area of a triangle where the base and the height are given. But in this resource, it is up to your geometers to identify the base and height of the triangle. In fact, your pupils will learn that there are three possible base-height pairs.
5th - 7th Math 10 Views 8 Downloads CCSS: Designed
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 which makes a good transition question or mini-assessment.
5th - 7th Math 9 Views 8 Downloads CCSS: Designed