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Label each angle as acute, right, obtuse, straight, or reflex. (the first one is done for you)


Why must an angle’s measurement always be 360° or less? It is part of a full circle, which measures 360°.
What is the name used to classify a 90° angle? Right angle

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Related Resources
The various resources listed below are aligned to the same standard, (4MD05) taken from the CCSM (Common Core Standards For Mathematics) as the Geometry Worksheet shown above.
Recognize angles as geometric shapes that are formed wherever two rays share a common endpoint, and understand concepts of angle measurement:
 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 “onedegree angle,” and can be used to measure angles.
 An angle that turns through n onedegree angles is said to have an angle measure of n degrees.
Example/Guidance
Lines and Angles
Worksheet
 Measuring Angles: Foundation – Identifying fractions of a circle
 Identifying Angle Measurements
Similar to the above listing, the resources below are aligned to related standards in the Common Core For Mathematics that together support the following learning outcome:
Geometric measurement: understand concepts of angle and measure angles
 Adding & Subtracting Angles (From Example/Guidance)
 Using a Protractor (From Example/Guidance)
 Angles e.g. Naming and measuring (From Worksheet)
 Estimating Angles (From Worksheet)
 Measuring Angles Using a Protractor – inc. drawing angles (From Worksheet)
 Adding Angles – with adjacent angles (From Worksheet)
 Finding Unknown Angles – with adjacent angles (From Worksheet)