- Relationships Between Circles & Angles
All circles have 360 degrees. The angle above is showing 1 degree out of 360 degrees.
Complementary angles are two or more angles whose sum measure 90 degrees
Supplementary angles are two or more angles whose sum measure 180 degrees
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Standards
4.MD. 5 Recognize angles as geometric shapes that are formed wherever two rays share a common endpoint, and understand concepts of angle measurement:
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.
b. An angle that turns through n one-degree angles is said to have an angle measure of n degrees.
4.MD. 6 Measure angles in whole-number degrees using a protractor. Sketch angles of specified measure.
4.MD. 5 Recognize angles as geometric shapes that are formed wherever two rays share a common endpoint, and understand concepts of angle measurement:
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.
b. An angle that turns through n one-degree angles is said to have an angle measure of n degrees.
4.MD. 6 Measure angles in whole-number degrees using a protractor. Sketch angles of specified measure.