Classify Triangles Worksheets
Related Pages
Math Worksheets
Lessons for Fourth Grade
Free Printable Worksheets
Printable “Geometry” Worksheets:
Types of Angles
Lines of Symmetry
Classify Triangles
Classify Triangles Worksheets
In these free math worksheets, students analyze and classify triangles based on side length, angle measure, or both.
How to classify triangles?
Triangles can be classified based on the length of their sides and the size of their angles.
Here are the common classifications:
Based on the length of the sides:
- Scalene triangle: A triangle with no equal sides.
- Isosceles triangle: A triangle with two equal sides.
- Equilateral triangle: A triangle with three equal sides.
Based on the size of the angles:
- Acute triangle: A triangle with all three angles less than 90 degrees.
- Right triangle: A triangle with one angle equal to 90 degrees.
- Obtuse triangle: A triangle with one angle greater than 90 degrees.
Combining the two classifications, we can have more specific classifications such as:
- Right isosceles triangle: A triangle with one angle equal to 90 degrees and two equal sides.
- Obtuse scalene triangle: A triangle with one angle greater than 90 degrees and no equal sides.
- Acute equilateral triangle: A triangle with all three angles less than 90 degrees and three equal sides.
Have a look at this video if you need to review how to classify by sides and angles.
Click on the following worksheet to get a printable pdf document.
Scroll down the page for more Classify Triangles Worksheets.
More Classify Triangles Worksheets
Printable
Classify Triangles Worksheet #1
(Answers on the second page.)
Classify Triangles Worksheet #2
(Answers on the second page.)
Analyze Triangles Word Problems
- A triangle cannot have one obtuse angle and one right angle. True or False?
-
Show Answer
True
-
Show Answer
- An equilateral triangle is isosceles. True or False?
-
Show Answer
True
-
Show Answer
- Every triangle has at least ____ acute angles.
-
Show Answer
Two
-
Show Answer
- A triangle cannot have both an acute angle and a right angle. True or False?
-
Show Answer
False
-
Show Answer
- A right triangle is always scalene. True or False?
-
Show Answer
False
-
Show Answer
Related Lessons & Worksheets
Check out our most popular games!
Fraction Concoction Game:
Master fractions in the lab: mix, add, and subtract beakers to create the perfect concoction!
Fact Family Game:
Complete fact families and master the link between addition & subtraction and multiplication & division.
Number Bond Garden:
Clear the board by matching number pairs that sum to ten in this garden-themed mental math puzzle.
Online Addition Subtraction Game:
Practice your addition and subtraction skills to help the penguin find its mummy.
We welcome your feedback, comments and questions about this site or page. Please submit your feedback or enquiries via our Feedback page.