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More Grade 3 math Lessons

More Lessons on Triangles

Geometry Worksheets

Videos, stories and songs to teach Grade 3 students the different types of triangles: Equilateral, Isosceles, Scalene

**Types of Triangles**

An Equilateral triangle has three equal sides.

An Isosceles triangle has two equal sides.

A Scalene triangle has no equal sides.

An Acute triangle has three acute angles (less than 90 degrees)

An Obtuse triangle has one obtuse angle (more than 90 degrees)

A Right triangle has one right angle (equals to 90 degrees)

The following diagrams show the types of triangle based on sides. Scroll down the page for more examples and solutions of types of triangles.

### Types of Triangles

Various types of triangles based on sides and angles.

Equilateral, Isosceles, Scalene,

Acute, Obtuse, Right**Classify Triangles Based on Sides and Angles**

Learn to classify triangles based on sides and angles.**Triangle Song: right, equilateral, isosceles, and scalene triangles**

Lyrics:

Here we go ‘round the triangle, triangle, the triangle

Here we go ‘round the triangle

It’s geometry

Equilateral triangle, triangle, triangle

Equilateral triangle

3 congruent sides

Isosceles triangle, triangle, triangle

Isosceles triangle

2 congruent sides

Scalene, scalene triangle

Scalene triangle

No congruent sides

**Triangle Song: Types of Triangles For Kids**

Lyrics:

Isosceles triangles have two equal sides

like this mountain we’re about to climb;

and since one angle’s over ninety degrees,

an obtuse triangle is what we see.

If you add up every angle,

there are one hundred eighty degrees in a triangle.

If the length is equal on every side,

we say it’s equilateral, like this road sign;

and since every angle’s less than 90 degrees,

an acute triangle it will also be.

If skateboard ramps are your scene,

with three different sides they’re called scalene.

That triangle would also be called right

if a ninety degree angle is inside.

There are two ways to classify triangles:

by their sides and their angles,

like sails out on the high seas

can be right or isosceles.

Or look at the foot of this goose;

it’s scalene and obtuse.

When you break pool balls with a cue,

they’re equilateral and acute.

**Types of Triangles**

Learn about the different types of triangles including: right, equilateral, isosceles, and scalene. It includes some helpful tips on how to remember the names by looking at the first letter of the triangle name.**Types of Triangles: Equilateral, Isosceles, Scalene**

**Classifying Triangles by angles and by length of sides**

You can use the free Mathway calculator and problem solver below to practice Algebra or other math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.

More Lessons on Triangles

Geometry Worksheets

Videos, stories and songs to teach Grade 3 students the different types of triangles: Equilateral, Isosceles, Scalene

An Equilateral triangle has three equal sides.

An Isosceles triangle has two equal sides.

A Scalene triangle has no equal sides.

An Acute triangle has three acute angles (less than 90 degrees)

An Obtuse triangle has one obtuse angle (more than 90 degrees)

A Right triangle has one right angle (equals to 90 degrees)

The following diagrams show the types of triangle based on sides. Scroll down the page for more examples and solutions of types of triangles.

Equilateral, Isosceles, Scalene,

Acute, Obtuse, Right

Learn to classify triangles based on sides and angles.

Lyrics:

Here we go ‘round the triangle, triangle, the triangle

Here we go ‘round the triangle

It’s geometry

Equilateral triangle, triangle, triangle

Equilateral triangle

3 congruent sides

Isosceles triangle, triangle, triangle

Isosceles triangle

2 congruent sides

Scalene, scalene triangle

Scalene triangle

No congruent sides

Lyrics:

Isosceles triangles have two equal sides

like this mountain we’re about to climb;

and since one angle’s over ninety degrees,

an obtuse triangle is what we see.

If you add up every angle,

there are one hundred eighty degrees in a triangle.

If the length is equal on every side,

we say it’s equilateral, like this road sign;

and since every angle’s less than 90 degrees,

an acute triangle it will also be.

If skateboard ramps are your scene,

with three different sides they’re called scalene.

That triangle would also be called right

if a ninety degree angle is inside.

There are two ways to classify triangles:

by their sides and their angles,

like sails out on the high seas

can be right or isosceles.

Or look at the foot of this goose;

it’s scalene and obtuse.

When you break pool balls with a cue,

they’re equilateral and acute.

Learn about the different types of triangles including: right, equilateral, isosceles, and scalene. It includes some helpful tips on how to remember the names by looking at the first letter of the triangle name.

Rotate to landscape screen format on a mobile phone or small tablet to use the **Mathway** widget, a free math problem solver that **answers your questions with step-by-step explanations**.

You can use the free Mathway calculator and problem solver below to practice Algebra or other math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.

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