Triangle Teacher Resources
Find Triangle educational ideas and activities
Showing 1 - 20 of 8,821 resources
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 49 Views 100 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 25 Views 37 Downloads CCSS: Designed
Investigating the Properties of the Centroid of a Triangle
Your geometry learners will use dynamic geometry software to find the centroid of a triangle. Then they will play a game to find the balancing point of a triangle and compare it to the centroid..
9th - 11th Math 3 Views 1 Download CCSS: Designed
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 connects geometry, earth science, and delicious snacks to teach kids about ecosystems and math.
4th Math 34 Views 16 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 27 Views 59 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
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 145 Views 213 Downloads CCSS: Designed
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
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 11 Views 11 Downloads CCSS: Adaptable
Triangles Embedded in a Square
Looking for a nice activity that will help deepen your geometry learners' understanding of similar triangles? This activity maps a number of triangles embedded in a square on dot graph paper. Young geometers need to find as many different similar triangle pairs as they can find and justify their solutions.
9th - 12th Math 13 Views 7 Downloads CCSS: Designed
Discovering AA Similarity Discovery
Your collaborative learners will create, analyze, and then discover the Angle-Angle criterion for similar triangles, as well as experience many of the math practice standards in a very well-organized lesson. They will explore the Angle-Angle criteria further by finding supporting examples that justify the rule holds true for all types of triangles.
9th - 11th Math 3 Views 3 Downloads
Your young designers use geometric concepts and isosceles triangle properties to create a blue print for a pennant with specific criteria. Second, they write a geometric proof outlining the correlation between base angle measures and the side measures of their pennant.
9th - 11th Math 5 Views 2 Downloads CCSS: Designed
Area of Inscribed Equilateral Triangle (some basic trig used)
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.
12 mins 9th - 12th Math 4 Views 1 Download
Intro to 30-60-90 Triangles
As the fourth part of a series on the Pythagorean Theorem, Sal continues an exploration of the ways to calculate the length of sides of a right triangle using algebra. He also explores using this theorem to solve problems involving a right triangle with 30 degree and 60 degree angles.
10 mins 9th - 10th Math 3 Views 0 Downloads
Although a rather complicated topic, this video manages to clearly explain the concept of solving problems involving similar triangles. It employs problem solving to determine whether two figures are similar triangles. In addition, it provides guidance for finding the anglesÕ values.
10 mins 9th - 10th Math 7 Views 4 Downloads
The process for calculating values using a right triangle with angles of 45 degrees is covered in this third portion of the Pythagorean Theorem series. Here, Sal uses algebra to calculate the value of an angle. The solution to the sample problems involves a complicated resolution.
10 mins 9th - 10th Math 6 Views 3 Downloads
Area of Diagonal Generated Triangles of Rectangle are Equal
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 this for test preparation purposes.
5 mins 9th - 10th Math 3 Views 1 Download