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Common Core Math 4.md.5a

Measurement And Data: Geometric Measurement: Understand Concepts Of Angle And Measure Angles.

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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