Classifying Triangles Worksheet
Identify and classify different types of triangles based on their sides and angles for Grade 3 math.
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Classifying Triangles
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Read each question carefully and classify the triangles based on their sides or angles.
1. Which type of triangle has all three sides of equal length?
Isosceles triangle
Scalene triangle
Equilateral triangle
Right triangle
2. A triangle with one angle greater than 90 degrees is called a(n) triangle.
Acute
Obtuse
Right
Equilateral
3. A triangle with two sides of equal length is called an triangle.
4. A triangle with three different side lengths is called a triangle.
5. Look at the triangle below. Is it an acute, obtuse, or right triangle?
6. Look at the triangle below. Based on its sides, is it equilateral, isosceles, or scalene?
7. A right triangle can also be an equilateral triangle.
True
False
8. An isosceles triangle always has two acute angles.
True
False
Match each triangle description with its classification.
9. All sides are different lengths.
a. Equilateral
10. One angle is exactly 90 degrees.
b. Right
11. All angles are less than 90 degrees.
c. Scalene
12. All sides are the same length.
d. Acute