AI Tutor

Premium Lesson

Upgrade to unlock this lesson, practice questions, and your personal tutor.

This lesson is part of a track

Public learning track

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 ScalesNot started yet
  7. Using a Protractor to Measure Acute and Obtuse AnglesNot started yet
  8. Drawing Benchmark Angles with ProtractorsYou are here
  9. Estimating Angle Measures in Everyday ObjectsNot started yet
View full track

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.