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First/Geometry

Measuring Angles with a Protractor

Read the protractor to measure angles in degrees, from acute to obtuse.
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Study Guide

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Practice Questions

  1. Measure this angle in degrees.
    Show answer

    100°

  2. Use the protractor to find the angle measure.
    Show answer

    25°

  3. What is the measure of this angle?
    Show answer

    35°

  4. Read the angle in degrees from the protractor.
    Show answer

    40°

  5. Measure this angle in degrees.
    Show answer

    80°

Quick Tip
Read the number on the protractor where the other ray crosses. Make sure to read the correct scale (inner or outer).
Teacher Resources
Lesson Plan

Introduction to Angles and Measurement

Standards
4.MD.C.6
Printable Aids
Protractor TemplateAngle Types Chart
Teaching Notes

Emphasize correct protractor alignment with the vertex and baseline. Guide learners to read the correct scale.

Vocabulary
Angle: Two rays sharing a common endpoint.
Protractor: Tool used to measure angles.
Vertex: The point where two lines meet.
Common Mistakes
  • Incorrect alignment of protractor
  • Reading the wrong scale
  • Misidentifying angle type
  • Estimating instead of measuring
Differentiation
SupportUse larger angles; provide protractors with clear markings or pre-aligned examples.
ChallengeDraw angles of given measures; measure real-world angles; estimate first.
Discussion Questions
  • How do we properly position a protractor?
  • Why do protractors have two sets of numbers?
  • What is a 'degree' in angle measurement?
  • Can an angle be measured from either side?
Extension Activities
  • Draw angles of specific measures.
  • Estimate angles before measuring.
  • Identify angles in the classroom.
Parent Tip

Use a paper plate and marker to create a pretend protractor.

Learning Path
Skill Cluster

Geometry & Measurement

Grade Level

4-5

Skills Practiced
Measure angles protractorIdentify angle typesAngle notation