IXL | Classify triangles | 5th grade math

Classify the triangle.

right, scalene

acute, scalene

right, isosceles

acute, isosceles, but not equilateral

obtuse, scalene

acute, equilateral

obtuse, isosceles

ref_doc_title.

Learn with an example

Classify the triangle.

right, scalene

acute, scalene

right, isosceles

acute, isosceles, but not equilateral

obtuse, scalene

acute, equilateral

obtuse, isosceles

You can classify a triangle using its sides and using its angles.

Classify using angles	Classify using sides
An acute triangle has three acute angles.	A scalene triangle has no equal sides.
A right triangle has one right angle.	An isosceles triangle has two equal sides.
An obtuse triangle has one obtuse angle.	An equilateral triangle has three equal sides.

First, classify the triangle using its angles.

One angle is larger than a right angle. This means the triangle has one obtuse angle.

So, this is an obtuse triangle.

Then, classify the triangle using its sides.

The triangle has no equal sides.

So, this is a scalene triangle.

This is an obtuse, scalene triangle.

Looking for more? Try these:

$Confetti$

Now entering the Challenge Zone—are you ready?

hr	min	sec
00	00	04

Teacher tools

Work it out

Not feeling ready yet? These can help: