Grade 4 · Measurement and Data

CCSS.MATH.CONTENT.4.MD.C.5a

An 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.

Read this standard on the official Common Core site

Lessons that teach this standard

• Angles: Naming, Measuring and Adding

  What an angle is, why a degree is a fraction of a full turn, how to name angles as acute, right or obtuse, and why angle measures add when angles sit side by side.