7th Grade Math - Types of Triangles

There are 6 basic types of triangles which are distributed into 2 different categories.
The first category is based upon measurement of angles. These triangles are Right triangle, Acute triangle, and Obtuse triangle.

The second category includes the triangles based on the measurements of their sides. These triangles are called Equilateral triangle, Isosceles triangle, and Scalene triangle. Here is a description of each of the triangles:

Right Triangle: One angle of exactly 90 degrees.
Acute Triangle: All three angles are less than 90 degrees.
Obtuse Triangle: Only one angle is more than 90 degrees.
Equilateral Triangle: All of the sides are of equal measurement.
Isosceles Triangle: Two of the sides are the same in measurement.
Scalene Triangle: All of the sides are of different measurement.

Types of Triangles -7th Grade Math

Introduction to Triangles

Types of Triangles

Though we've been introduced to the concept of 'triangles' since kindergarten, what we may not know is that there are so many different types of triangles. That's what we will be learning in this lesson!

Remember that there are 6 types of triangles:

• Equilateral Triangle
• Isosceles Triangle
• Scalene Triangle
• Right Triangle
• Obtuse Triangle
• Acute Triangle

Examples

EQUILATERAL TRIANGLE

ISOSCELES TRIANGLE

SCALENE TRIANGLE

 

RIGHT TRIANGLE

 

 

 

 

 

 

OBTUSE TRIANGLE

 

 

 

 

ACUTE TRIANGLE

 

 

 

 

 

 

Triangles and their Types

Preview

I bet you knew about from when you were in Kindergarten but did you ever come to realize that there are actually different types of triangles and each have a name.These are the triangles and their descriptions:

Equilateral Triangle-All three sides are equal.

Isosceles Triangle-Two sides are the same length, but one side is different.

Scalene Triangle-All sides are different.

Right Triangle-One angle is a right angle.

Acute Triangle-One angle is an acute angle.
 

 Obtuse Triangle-One angle is an obtuse angle.

These are all the six types of angles and the first three triangles are determined by the length of their sides and the other three are determined by the measurements of their angles.
So now you know that there are different types of triangles so the next time you spot one try and figure out which one it is.
Now try some of these and make sure to watch the video on YouTube.

Example

What type of triangle is this?

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