 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.
Clusters should not be sorted from Major to Supporting and then taught in that order. To do so would strip the coherence of the mathematical ideas and miss the opportunity to enhance the major work of the grade with the supporting clusters.

Also Assesses:
MAFS.4.MD.3.6
 Assessment Limits :
Items may contain whole number degree measures within 0° and 360°. For identification, angles are less than 360°. For construction, angles are less than 180°. Items may not require estimating the exact measures of angles.  Calculator :
No
 Context :
Allowable
 Test Item #: Sample Item 1
 Question: Fill in the circles to select the category of measure for each angle.
 Difficulty: N/A
 Type: MI: Matching Item
 Test Item #: Sample Item 2
 Question:
An angle is shown.
What is the measure, in degrees, of the angle?
 Difficulty: N/A
 Type: EE: Equation Editor
 Test Item #: Sample Item 3
 Question:
For MAFS.4.MD.3.5a:
Which is an angle?
 Difficulty: N/A
 Type: MC: Multiple Choice
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Assessments
Formative Assessments
Image/Photograph
Lesson Plans
Original Student Tutorial
Tutorials
MFAS Formative Assessments
Students are asked to circle figures that show angles from a set of figures and then describe the defining attributes of angles.
Students are asked to analyze two angles and explain how their measures are determined.
Students are asked determine angle measures based on how many onedegree turns are made.
Students are given two angles with the same angle measure but with sides of different lengths and asked to explain which component of an angle determines its measure.
Original Student Tutorials Mathematics  Grades K5
Discover what an angle is by helping to program a robot through an obstacle course in this interactive tutorial.
Student Resources
Original Student Tutorial
Discover what an angle is by helping to program a robot through an obstacle course in this interactive tutorial.
Type: Original Student Tutorial
Tutorials
in this tutorial, students will learn about central angles and arcs of a circle.
Type: Tutorial
This Khan Academy tutorial video demonstrates the relationship between the measurement of an angle and the arc of a circle.
Type: Tutorial
This Khan Academy tutorial video presents how an angle is formed and labeled.
Type: Tutorial
This video discusses the definition of an angle and how to name an angle.
Type: Tutorial