Equilateral Triangle Teacher Resources

Find Equilateral Triangle lesson plans and worksheets
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Lesson Planet

Math Antics Geometry Video Lessons

For Teachers 4th - 8th Standards
The point of this collection of 12 videos is to introduce learners to three basic parts of geometry—points, lines, and planes. The presenter provides definitions, shows how to classify shapes, provides examples, and shows how to use...
Lesson Planet

EngageNY Geometry Module 1: Congruence, Proof, and Constructions

For Teachers 9th - 12th Standards
The 36 lessons in the Geometry Module 1 collection address transformations in teaching geometry brought on by Common Core. The focus here is on transformations and the relationships between transformations and congruence. Teacher...
5:02
Lesson Planet

Why Are the Angles of Equilateral Triangles Always Equal to 60¼?

For Teachers 6th - 10th
Learn how to identify an equilateral triangle by evaluating its congruent sides. Once you've determined that that sides are congruent you'll be able to use the triangle sum theorem to determine the angles in an equilateral triangle. This...
3:02
Lesson Planet

Equilateral Triangles: Lesson

For Students 8th - 11th Standards
Take a second look at triangles that are equal all the way around. The video reminds viewers what an equilateral triangle is and points out that the three angles are the same. Using the fact that equilateral triangles are also isosceles,...
11:39
Lesson Planet

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.
2:47
Lesson Planet

Constructing Equilateral Triangles and 60 Degree Angles

For Students 8th - 12th Standards
Creating a 60-degree angle also creates an equilateral triangle. By watching the video, individuals learn the steps required to construct a 60-degree angle. The presentation shows that the process is the same for constructing an...
Lesson Planet

Coordinates of Equilateral Triangles

For Students 9th - 12th Standards
Can it be constructed? The task poses the question whether it is possible to have an equilateral triangle with its vertices located at integer coordinates. Pupils work with their knowledge of trigonometric ratios and the Pythagorean...
1 In 1 Collection
EngageNY

Construct an Equilateral Triangle (part 1)

For Teachers 9th - 10th Standards
Drawing circles isn't the only thing compasses are good for. In this first installment of a 36-part series, high schoolers learn how to draw equilateral triangles by investigating real-world situations, such as finding the location of a...
Lesson Planet

Equilateral Triangle in a Circle

For Students 9th - 12th Standards
I thought compasses could only draw circles! Scholars draw an equilateral triangle inscribed in a given circle. They accomplish this by using a compass and straightedge as the solution strategy.
9:51
Lesson Planet

SAT Prep: Test 1 Section 6 Part 5

For Students 9th - 12th
Back with "more energy," Sal begins his explanation of problems 15-18 on page 412 of The Official SAT Study Guide. Problems include angles of equilateral triangles, rectangles, and graphing slopes.
Lesson Planet

Equilateral Triangle Symmetries Closure Activity

For Teachers Higher Ed
Students explore the symmetries of an equilateral triangle. In this lesson on symmetry, students determine the composition of given equilateral triangles using both rotational and reflectional symmetries.
9:55
Lesson Planet

SAT Prep: Test 4 Section 2 Part 5

For Students 9th - 12th
Picking up where he left off (problem 17), Sal demonstrates graphing functions with an informative and clear explanation. Additionally, problem 18 involves finding the values of angles in an equilateral triangle.
Lesson Planet

NUMB3RS Activity: A Group of Symmetries

For Teachers 10th - 12th
Students investigate the symmetries of an equilateral triangle. In this geometry lesson, students explore and visualize the reflection and rotational symmetries of an equilateral triangle. The activity relates the geometry of the...
Lesson Planet

Circles: Geometry Review Worksheet

For Students 10th Standards
Tenth graders solve and complete 14 different geometry problems. First, they find the area and circumference of a circle with a given radius. Then, they find the area between a circle and an inscribed equilateral triangle given the...
Lesson Planet

Reflections and Equilateral Triangles II

For Teachers 9th - 10th Standards
Given the lines of symmetry in an equilateral triangle, your learners find where the pre-image vertices are mapped onto the new image. They explore the properties of equilateral triangles, the impact of reflections, and the idea that the...
Lesson Planet

Finding the Area of an Equilateral Triangle

For Teachers 9th - 11th Standards
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...
Lesson Planet

Reflections and Equilateral Triangles

For Teachers 9th - 10th Standards
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 prove...
Lesson Planet

Perimeter of Equilateral Triangle

For Students 6th - 8th
In this perimeter instructional activity, students calculate the perimeter of 6 equilateral triangles.
Lesson Planet

Equilateral Triangles

For Teachers 4th - 5th
Students examine the attribute of equilateral triangles. In this equilateral triangle lesson, students examine a number of paper triangles to determine how they are classified. They determine how triangles are depicted in Navajo rugs.
Lesson Planet

Constructions of Isosceles and Equilateral Triangles

For Teachers 4th - 9th
Learners explore the difference between drawing and constructing a triangle utilizing The Geometer's Sketchpad on the computer. They create, develop and script constructions for both isosceles and equilateral triangles. Each student has...
Lesson Planet

Classify Triangles - Problem Solving 15.3

For Students 4th - 5th
Fourth and fifth graders count and label triangular figures, compare a square and equilateral triangle, explain classifications of triangles, and solve a word problem about an isosceles triangle. There are four critical-thinking...
Lesson Planet

Equilateral Triangle Unit

For Students 5th - 6th
Students can practice both their folding and their equilateral triangles in this fun activity. By folding a single piece of paper according to the instructions, students create a series of equilateral shapes that they can then study. The...
1 In 1 Collection
EngageNY

Construct an Equilateral Triangle (part 2)

For Teachers 9th - 10th Standards
Triangles, triangles, and more triangles! In this second installment of a 36-part series, your young mathematicians explore two increasingly challenging constructions, requiring them to develop a way to construct three triangles that...
5:33
Lesson Planet

What are Equilateral, Isosceles, and Scalene Triangles?

For Teachers 5th - 8th
Triangles are classified by their angle measurement as well as by the length of their sides. Here are some names that identify the types of triangles: right, isosceles, equilateral, scalene, obtuse, and acute. Watch this video to learn...

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