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4md5a Worksheets

Measurement and Data Geometric measurement: understand concepts of angle and measure angles. 5Recognize angles as geometric shapes that are formed wherever two rays share a common endpoint, and understand concepts of angle measurement: 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.

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Angle Estimation

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Look at an angle and make a reasonable guess of its size in degrees.
Use benchmark angles like 90°, 180°, and 360° to estimate other angles.
Compare a few degree choices and pick the one that is closest to the angle shown.