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Types of Triangles

Related Topics: 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 sides

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
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
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

Try the free Mathway calculator and problem solver below to practice various 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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