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Measurement & Geometry

Grade 4 · Stretch challenge · 10 questions · Version PG-13R49Y-5HDI

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1.Classify a 90° angle.
2.Reflect (9, 5) across the vertical line x = 11.
3.Classify a 20° angle.
4.Reflect (14, 12) across the vertical line x = 16.
5.Classify a 70° angle.
6.Reflect (14, 15) across the vertical line x = 16.
7.Classify a 170° angle.
8.Reflect (11, 3) across the vertical line x = 18.
9.Classify a 10° angle.
10.Reflect (2, 10) across the vertical line x = 9.

Answers and teaching notes

Use the answers to check the work after the learner finishes. For writing prompts, the guide describes what a strong response should include.

Show answers for version 13
  1. Classify a 90° angle.Right
  2. Reflect (9, 5) across the vertical line x = 11.(13, 5)
  3. Classify a 20° angle.Acute
  4. Reflect (14, 12) across the vertical line x = 16.(18, 12)
  5. Classify a 70° angle.Acute
  6. Reflect (14, 15) across the vertical line x = 16.(18, 15)
  7. Classify a 170° angle.Obtuse
  8. Reflect (11, 3) across the vertical line x = 18.(25, 3)
  9. Classify a 10° angle.Acute
  10. Reflect (2, 10) across the vertical line x = 9.(16, 10)

Worked example

Sketch and label the quantities before selecting a measurement or geometry operation.

Common mistake

Using the right numbers with the wrong unit or formula.

Helpful hint

Write the unit beside every measurement.