Classifying Triangles
A worksheet for 4th graders to practice classifying triangles by their sides and angles.
Includes
Standards
Topics
Classifying Triangles
Name:
Date:
Score:
Read each question carefully and classify the triangles based on their sides and angles.
1. Which type of triangle has all three sides of equal length?
Isosceles
Scalene
Equilateral
Right
2. A triangle with one angle greater than 90 degrees is called a(n) triangle.
Acute
Obtuse
Right
Equiangular
3. A triangle with two sides of equal length is called an triangle.
4. A triangle with no sides of equal length is called a triangle.
5. A triangle with all angles less than 90 degrees is called an triangle.
6. Classify the triangle below by its sides and angles. (Sides: 5cm, 5cm, 7cm; Angles: 70°, 70°, 40°)
Classification by sides:
Classification by angles:
7. Classify the triangle below by its sides and angles. (Sides: 3cm, 4cm, 5cm; Angles: 30°, 60°, 90°)
Classification by sides:
Classification by angles:
8. An equilateral triangle is always an acute triangle.
True
False
9. A right triangle can also be an obtuse triangle.
True
False
Match each triangle type with its description.
10. Equilateral
a. Has one angle greater than 90 degrees
11. Scalene
b. Has all three sides of equal length
12. Obtuse
c. Has no sides of equal length
13. Isosceles
d. Has two sides of equal length
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