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Angles as Turns, Classification, and Protractor Measurement

3rd Grade · Math · Open Global Math

9 lessons

Goal

Understand angles as geometric turns, classify acute, right, obtuse, and straight angles, and measure and draw benchmark angles using protractors.

9 lessons
0 of 9 done
  1. Exploring Angles as Turns: Whole, Half, and Quarter TurnsUp next
  2. Understanding Angles as Geometric Openings in DegreesNot started yet
  3. Comparing Angles to a Right-Angle BenchmarkNot started yet
  4. Classifying Angles as Right, Straight, Acute, or ObtuseNot started yet
  5. Angle Properties on Straight LinesNot started yet
  6. Reading a Protractor: Inner and Outer ScalesYou are here
  7. Using a Protractor to Measure Acute and Obtuse AnglesNot started yet
  8. Drawing Benchmark Angles with ProtractorsNot started yet
  9. Estimating Angle Measures in Everyday ObjectsNot started yet
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Learning standards covered

GlobalOGM.4.G.4Open Global Math Standards 2026™ · 3rd Grade

Understand angles as geometric attributes and dynamic measures of turn; identify right angles, acute angles, obtuse angles, straight angles, and full rotations; compare angles to right angles (half-turns, 3/4 turns, full turns); draw and measure benchmark angles (30°, 45°, 60°, 90°) using protractors and set squares.