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Math for Kids23 chapters | 325 lessons

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Instructor:
*Jennifer Zaur*

Jennifer has taught at both the elementary and university level. She holds a masterâ€™s degree in curriculum and instruction.

In this lesson, you will learn about the three different types of triangles, which are scalene, isosceles, and equilateral. We will discuss how to identify each type of triangle.

There are many different types of shapes, but one of the most common types of shapes is a triangle. A triangle is a shape that has three sides and three angles. Another fun fact about a triangle is the angles of a triangle always add up to 180 degrees.

So we know that a shape with three sides and angles is a triangle, but did you know that there is more than one type of triangle? The three main types of triangles are scalene, isosceles, and equilateral. In order to determine which type of triangle you have, you must look at the length of each of the sides of the triangle. Let's take a look at each one.

The first and most common type of triangle is called a **scalene triangle**. A scalene triangle is a triangle that has **no** equal sides. In other words, the lengths of all of the sides of the triangle are different. Since none of the sides of a scalene triangle are equal, none of the angles are equal either.

A second type of triangle is an **isosceles triangle**. An isosceles triangle is a triangle that has **two** equal sides. Since two sides are equal, one side is either long with two shorter sides or one side is short with two longer sides. On an isosceles triangle, two of the angles are also equal.

A third type of triangle is an **equilateral triangle**. All three sides on an equilateral triangle are the same length or equal. Another way to say this is that all three sides of an equilateral triangle are congruent (the same). Along with all of the sides of an equilateral triangle being equal, all of the angles are equal as well.

You might be wondering how you can remember the three main types of triangles. Here are some tricks to help you out:

- Scalene - The word SCALEne has the word SCALE in it. If you put a SCALEne triangle on a SCALE it would not balance because all of the sides are uneven.
- Isosceles - The word isosceles starts with the letter 'I' which sounds like the word 'eyes'. You have TWO eyes and an isosceles triangle has TWO equal sides.
- Equilateral - The word equilateral starts like the word EQUAL. An equilateral triangle has three equal sides.

You just learned about the three main types of triangles. A **scalene triangle** has no equal sides, an **isosceles triangle** has **two** equal sides, and an **equilateral triangle** has three equal sides. If you can remember this, you will have no trouble identifying the three main types of triangles.

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Math for Kids23 chapters | 325 lessons

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