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Celeste International School

Grade 4 · Worksheet

2D shape and pattern

Types of triangles

Name: ______________________________Date: ______________Score: ______ / 20
  1. 1.

    What is a triangle with all three sides equal called?

    1. AEquilateral
    2. BIsosceles
    3. CScalene
    4. DRight-angled
  2. 2.

    How many equal sides does an equilateral triangle have?

  3. 3.

    A triangle has sides 5 cm, 5 cm and 8 cm. What type is it?

    1. AIsosceles
    2. BEquilateral
    3. CScalene
    4. DRight-angled
  4. 4.

    An equilateral triangle has three equal sides and three equal angles.

    True False
  5. 5.

    A triangle has sides 3 cm, 3 cm and 3 cm. What type is it?

    1. AEquilateral
    2. BIsosceles
    3. CScalene
    4. DRight-angled
  6. 6.

    A triangle has sides 6 cm, 6 cm and 6 cm. What type is it?

    1. AEquilateral
    2. BIsosceles
    3. CScalene
    4. DRight-angled
  7. 7.

    A triangle has sides 8 cm, 8 cm and 8 cm. What type is it?

    1. AEquilateral
    2. BIsosceles
    3. CScalene
    4. DRight-angled
  8. 8.

    A triangle has sides 11 cm, 11 cm and 11 cm. What type is it?

    1. AEquilateral
    2. BIsosceles
    3. CScalene
    4. DRight-angled
  9. 9.

    A triangle has sides 14 cm, 14 cm and 14 cm. What type is it?

    1. AEquilateral
    2. BIsosceles
    3. CScalene
    4. DRight-angled
  10. 10.

    A triangle has sides 16 cm, 16 cm and 16 cm. What type is it?

    1. AEquilateral
    2. BIsosceles
    3. CScalene
    4. DRight-angled
  11. 11.

    A triangle has sides 4 cm, 4 cm and 6 cm. What type is it?

    1. AEquilateral
    2. BIsosceles
    3. CScalene
    4. DRight-angled
  12. 12.

    A triangle has sides 9 cm, 9 cm and 6 cm. What type is it?

    1. AEquilateral
    2. BIsosceles
    3. CScalene
    4. DRight-angled
  13. 13.

    A triangle has sides 4 cm, 6 cm and 9 cm. What type is it?

    1. AEquilateral
    2. BIsosceles
    3. CScalene
  14. 14.

    What type of angle is 115°?

    1. AAcute
    2. BRight angle
    3. CObtuse
  15. 15.

    How many degrees is a quarter turn?

    °
  16. 16.

    What type of angle is 154°?

    1. AAcute
    2. BRight angle
    3. CObtuse
  17. 17.

    A triangle has sides 6 cm, 8 cm and 11 cm. What type is it?

    1. AEquilateral
    2. BIsosceles
    3. CScalene
  18. 18.

    Which angle is bigger, 157° or 54°?

    1. A157°
    2. B54°
  19. 19.

    A triangle has sides 7 cm, 8 cm and 10 cm. What type is it?

    1. AEquilateral
    2. BIsosceles
    3. CScalene
  20. 20.

    Select all the statements that are true of an EQUILATERAL triangle.

    • AAll 3 sides are equal
    • BAll 3 angles are 60°
    • CIt has a right angle
    • DIt has exactly 2 equal sides
    • EIt has 3 lines of symmetry
Celeste International School

Answer key

2D shape and pattern — Types of triangles

  1. 1.A. Equilateral
  2. 2.3
  3. 3.A. Isosceles
  4. 4.True
  5. 5.A. Equilateral
  6. 6.A. Equilateral
  7. 7.A. Equilateral
  8. 8.A. Equilateral
  9. 9.A. Equilateral
  10. 10.A. Equilateral
  11. 11.B. Isosceles
  12. 12.B. Isosceles
  13. 13.C. Scalene
  14. 14.C. Obtuse
  15. 15.90 °
  16. 16.C. Obtuse
  17. 17.C. Scalene
  18. 18.A. 157°
  19. 19.C. Scalene
  20. 20.A. All 3 sides are equal; B. All 3 angles are 60°; E. It has 3 lines of symmetry