# Measure Angles Using A Protractor Math Games

In this series of games, your students will learn to measure angles in whole-number degrees using a protractor. The Measure Angles Using A Protractor learning objective — based on CCSS and state standards — delivers improved student engagement and academic performance in your classroom, as demonstrated by research. This learning objective directly references 4.MD.C.6 as written in the common core national math standards.

Scroll down for a preview of this learning objective’s games and the concepts.

## Concepts Covered

In an angle, each ray determines a direction and the angle size measures the change from one direction to the other. Angles are measured with reference to a circle with its center at the common endpoint of the rays and the rays intersection points in relation to their fraction of the circular arc. An angle that turns through 1/360 of a circle is called a “one-degree angle,” and degrees are the unit used to measure angles. Measure angles using a circular protractor to avoid the mental trap of shapes of angles. Using a protractor, accurately sketch an angle with a given angle measurement.

When measuring an angle, the center point should align with the center point of the protractor, and one arm or ray should align with the base of the protractor. The other arm will determine the angle measure in relation to the first ray. When sketching an angle, draw a ray, align the protractor with the endpoint of the ray, and make a mark at the desired angle length. Use the ruler side of the protractor to sketch a line connecting the endpoint of the first ray and the mark made for the desired angle measurement. Sketch the line to form a vertex. Measure angles using a protractor. Estimate angle measures. Identify which angle is constructed to show a given angle measure.

A preview of each game in the learning objective is found below.

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