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Mathematics | Grade : 4
Domain - Measurement and Data
Cluster - Geometric measurement: understand concepts of angle and measure angles.
[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.
[AII.F-TF.A.1] -
Understand radian measure of an angle as the length of the arc on the unit circle subtended by the angle.
[MI.G-CO.A.1] -
Know precise definitions of angle, circle, perpendicular line, parallel line, and line segment, based on the undefined notions of point, line, distance along a line, and distance around a circular arc.
[MIII.F-TF.A.1] -
Understand radian measure of an angle as the length of the arc on the unit circle subtended by the angle.