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Grade 5 Classifying Triangles Worksheet with Answers

Grade 5 (US) · Year 6 (UK) · Class 5 (India) · Math

Unit 6: Geometry & GraphingClassifying FiguresCCSS 5.G.B.4

Classifying triangles by their sides and by their angles. This free upper elementary worksheet has 12 questions and a full answer key. Print it or save it as a PDF — every answer is checked by code, not guessed.

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Classifying Triangles

Grade 5 · Math

Score___ / 12

Name

Class

Date

Learning goal: Classifying Figures · CCSS 5.G.B.4

Directions: Use the pictures to help you. Circle the correct answer.

Example

A triangle has sides of 3 cm, 4 cm and 5 cm. Is it equilateral, isosceles or scalene?

Answer: scalene

  1. 1

    A triangle has sides of 5 cm, 5 cm and 4 cm. Is it equilateral, isosceles or scalene?

    4 cm5 cm5 cm
    EquilateralIsoscelesScalene
  2. 2

    A triangle has angles of 39°, 70° and 71°. Is it acute, right or obtuse?

    AcuteRightObtuse
  3. 3

    A triangle has angles of 95°, 56° and 29°. Is it acute, right or obtuse?

    AcuteRightObtuse
  4. 4

    A triangle has sides of 3 cm, 3 cm and 3 cm. Is it equilateral, isosceles or scalene?

    3 cm3 cm3 cm
    EquilateralIsoscelesScalene
  5. 5

    A triangle has sides of 3 cm, 3 cm and 5 cm. Is it equilateral, isosceles or scalene?

    5 cm3 cm3 cm
    EquilateralIsoscelesScalene
  6. 6

    A triangle has angles of 85°, 38° and 57°. Is it acute, right or obtuse?

    AcuteRightObtuse
  7. 7

    A triangle has angles of 85°, 49° and 46°. Is it acute, right or obtuse?

    AcuteRightObtuse
  8. 8

    A triangle has sides of 4 cm, 4 cm and 4 cm. Is it equilateral, isosceles or scalene?

    4 cm4 cm4 cm
    EquilateralIsoscelesScalene
  9. 9

    A triangle has angles of 86°, 63° and 31°. Is it acute, right or obtuse?

    AcuteRightObtuse
  10. 10

    A triangle has sides of 6 cm, 6 cm and 8 cm. Is it equilateral, isosceles or scalene?

    8 cm6 cm6 cm
    EquilateralIsoscelesScalene
  11. 11

    A triangle has sides of 9 cm, 9 cm and 9 cm. Is it equilateral, isosceles or scalene?

    9 cm9 cm9 cm
    EquilateralIsoscelesScalene
  12. 12

    A triangle has angles of 40°, 70° and 70°. Is it acute, right or obtuse?

    AcuteRightObtuse

★ Challenge corner for fast finishers

Each scale balances. Scale 1: circle + circle + square = 24; scale 2: circle + square = 13. What is one circle worth?

24Scale 113Scale 2

How did I do?

Teacher's comments

Free printable worksheets with answer keys · aethelsystems.com/worksheets/math/5/triangle_classify

Answer key (click to show)
  1. 1.isosceles
  2. 2.acute
  3. 3.obtuse
  4. 4.equilateral
  5. 5.isosceles
  6. 6.acute
  7. 7.acute
  8. 8.equilateral
  9. 9.acute
  10. 10.isosceles
  11. 11.equilateral
  12. 12.acute
  13. ★11 (challenge corner)

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How to use this worksheet

  • Use it as a 10–15 minute warm-up or homework task rather than a long drill.
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