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# MAFS.912.G-C.1.2

Identify and describe relationships among inscribed angles, radii, and chords. Include the relationship between central, inscribed, and circumscribed angles; inscribed angles on a diameter are right angles; the radius of a circle is perpendicular to the tangent where the radius intersects the circle.
Subject Area: Mathematics
Domain-Subdomain: Geometry: Circles
Cluster: Level 2: Basic Application of Skills & Concepts
Cluster: Understand and apply theorems about circles. (Geometry - Additional Cluster) -

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.

Date of Last Rating: 02/14
Status: State Board Approved
Assessed: Yes

### TEST ITEM SPECIFICATIONS

• Item Type(s): This benchmark may be assessed using: EE item(s)

• Assessment Limits :
Items may include finding or describing the length of arcs when given
information.
• Calculator :

Neutral

• Clarification :
Students will solve problems related to circles using the properties of
central angles, inscribed angles, circumscribed angles, diameters,
• Stimulus Attributes :
Items may be set in a real-world or mathematical context.
• Response Attributes :
Items may require the student to use or choose the correct unit of
measure.

### SAMPLE TEST ITEMS (1)

• Test Item #: Sample Item 1
• Question:

In the diagram shown, chords AB and CD intersect at E. The measure of  is 120º, the measure of  is (2x)º, and the measure of  is (4x)º.

What is the degree measure of ?

• Difficulty: N/A
• Type: EE: Equation Editor