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Triangle Types Bell Work

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Triangle Types Bell Work

Classify triangles by their side lengths and angles. For the drawing task, make each triangle clear and label its type.

Triangle vocabulary

A triangle with three equal sides has a special side-based classification. Isosceles: exactly two equal sides. Scalene: no equal sides. Right: one 90° angle. A triangle can be described by both its sides and its angles.

Classify each triangle

Choose the best answer for each question.

1.A triangle has side lengths of 6 inches, 6 inches, and 6 inches. What is its side-based classification?
  • Scalene
  • Isosceles
  • Equilateral
  • Right
2.A triangle has side lengths of 5 centimeters, 5 centimeters, and 8 centimeters. What is its side-based classification?
  • Equilateral
  • Isosceles
  • Scalene
  • Right
3.One angle in a triangle measures 90°. How is this triangle classified by its angles?
  • Acute
  • Right
  • Obtuse
  • Equilateral
4.Select every classification that could describe a triangle with three different side lengths.
  • Scalene
  • Right
  • Equilateral
  • Isosceles

Show what you know

Use side marks or angle marks in your drawings to show how you know each triangle fits its classification.

5.Draw four triangles: one with three equal sides, one with exactly two equal sides, one with three different side lengths, and one with a 90° angle. Label each drawing with its classification.
Draw and label your four examples here.
6.Complete the statement: An isosceles triangle has exactly equal sides.
7.Explain how the side lengths of a scalene triangle differ from the side lengths of an isosceles triangle.
8.Could a triangle be both right and isosceles? Explain using an example or angle measures.
9.Give one real-world object or feature that could have a triangular shape with three equal sides.
10.Give one real-world object or feature that could have an isosceles-triangle shape.
11.Give one real-world object or feature that could have a scalene-triangle shape.
12.Give one real-world object or feature that could have a right-triangle shape.

3 printable pages

  • Triangle Types Bell Work, page 1 of 3: Triangle vocabulary, Classify each triangle

    Page 1

  • Triangle Types Bell Work, page 2 of 3: Show what you know

    Page 2

  • Triangle Types Bell Work, page 3 of 3: 10. Give one real-world object or feature that could have an isosceles-triangle shape.

    Page 3

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