# Equilateral Triangle Teacher Resources

Find Equilateral Triangle lesson plans and worksheets

Showing

**1**-**24**of**400**resources
Lesson Planet

#### Equilateral Triangles: Lesson

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,...

Lesson Planet

#### Constructing Equilateral Triangles and 60 Degree Angles

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

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...

EngageNY

#### Construct an Equilateral Triangle (part 1)

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

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

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...

Lesson Planet

#### 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.

Lesson Planet

#### Area of Inscribed Equilateral Triangle (some basic trig used)

Lesson Planet

#### Equilateral Triangle in a Circle

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.

Lesson Planet

#### SAT Prep: Test 4 Section 2 Part 5

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

#### SAT Prep: Test 1 Section 6 Part 5

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

#### NUMB3RS Activity: A Group of Symmetries

Young scholars 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

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

#### Equilateral Triangles

In this equilateral triangles worksheet, students study the various triangles to identify equilateral triangles. Students may count the triangles.

Lesson Planet

#### Reflections and Equilateral Triangles II

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

#### 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 prove...

Lesson Planet

#### 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...

EngageNY

#### Construct an Equilateral Triangle (part 2)

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...

Lesson Planet

#### Equilateral Triangle Symmetries Closure Activity

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.

Lesson Planet

#### Classifying Triangles

Bring math and reading informational text together with a reading comprehension lesson. After kids read about isosceles, scalene, and equilateral triangles, they answer five comprehension questions to demonstrate how they can use context...

Lesson Planet

#### Construction Junction

A prescription for inscribing polygons makes for an interesting lesson. Individuals follow a set of written instructions to construct both an equilateral triangle and regular hexagon inscribed in a circle. An extra handout allow learners...

Lesson Planet

#### Best Triangle

What makes an equilateral triangle equilateral? It turns out it's much more than just the side lengths! Learners analyze four different triangles to determine the best equilateral triangle. They create a formula that they later use to...

Lesson Planet

#### Geometry Standardized Test Practice

In this angles and figures review learning exercise, 10th graders solve and complete 39 different multiple choice problems. First, they find the length of a line between two given points. Then, students name the type of transformation...

Lesson Planet

#### Geometry: Constructions

Sometimes a compass and straightedge are the correct tools for the job. Scholars use a given line segment to make geometric constructions. These include constructing a copy of the line segment, constructing an equilateral triangle, and...

Lesson Planet

#### Perimeter of Equilateral Triangle

In this perimeter worksheet, students calculate the perimeter of 6 equilateral triangles.