The Complete K-5 Math Learning Program Built for Your Child

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Get Ahead.

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Measure Angles

- 4th Grade Math

Identify common angle measures like right angles, straight angles etc. Identify angles in multiples of 90 degrees as a fraction of 360 degrees. Use a protractor to measure angles.

Common Core Alignment

4.MD.6Measure angles in whole-number degrees using a protractor. Sketch angles of specified measure.

4.MD.5.aAn angle is measured with reference to a circle with its center at the common endpoint of the rays, by considering the fraction of the circular arc between the points where the two rays intersect the circle. An angle that turns through 1/360 of a circle is called a "one-degree angle," and can be used to measure angles.

4.MD.5.bAn angle that turns through n one-degree angles is said to have an angle measure of n degrees.