Using a Circular Protractor

Examples, solutions, and videos to help Grade 4 students learn how to use a circular protractor to understand a 1-degree angle as 1/360 of a turn. Explore benchmark angles using the protractor.

Common Core Standards: 4.MD.5, 4.MD.6

New York State Common Core Math Grade 4, Module 4, Lesson 5

Download worksheets for Grade 4, Module 4, Lesson 5

The following diagram shows a worksheet to learn how to measure angles using a circular protractor. Scroll down the page for more examples of using the circular protractor.

 

NYS Math Module 4 Grade 4 Lesson 5 Application Problem

How many right angles can fit into a circle?

NYS Math Module 4 Grade 4 Lesson 5 Concept Development

Problem 1: Reason about the number of turns necessary to make a full turn with different fractions of a full turn.

Problem 2: Use a circular protractor to determine that a quarter-turn or a right angle measures 90 degrees, a half turn measures 180 degrees, a three quarter-turn measures 270 degrees, and a full rotation measures 360 degrees.

Problem 3: Measure and draw benchmark angles with the protractor.

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Lesson 5 Concept Development

We have a special name for 1/360 of a whole turn. It is called a degree. There are 360 degrees are in one whole turn?
A protractor is a tool that has been partitioned and marked off to show 360 degrees.

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NYS Math Module 4 Grade 4 Lesson 5 Problem Set

Find the measures of the following angles using your circular protractor.

NYS Math Module 4 Grade 4 Lesson 5 Homework

1. Identify the measures of the following angles.
   
2. Identify the measures of the following angles.

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