Common Core State Standards for Math
4.MD.C.5.a
6b9cbaef-d7cc-11e8-824f-0242ac160002 6b9f3cb3-d7cc-11e8-824f-0242ac160002 6b9ea608-d7cc-11e8-824f-0242ac160002 4.MD.C 4.MD.C.5 4.MD.C.5.a
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.
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