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8.

Make an Angle Using a Protractor

- 4th Grade Math

Make angles of specified measure (degrees) by rotating one arm (ray). Students also make angles that belong to categories like acute or obtuse angles, as well as special cases, such as right angle, straight angle etc.

Common Core Alignment

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

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