Geometry Circle Radian

What is the branch of mathematics that deals with shapes, angles, dimensions, and sizes?

• Trigonometry

• Algebra

• Geometry

• Calculus

What is the unit of measure for angles?

• Meter

• Degree

• Radian

• Centimeter

Match each diagram showing a sector with the measure of its central angle in radians.

• E: diagram E

• D: diagram D

• C: diagram C

• F: diagram F

• B: diagram B

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Calculate the radian measure of a 30 degree angle. Use any method you like, including sketching in the circle diagram provided. Explain or show your reasoning.

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Lin thinks that the central angle in circle A is congruent to the central angle in circle B. Do you agree with Lin? Show or explain your reasoning.

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Select all true statements.

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• The fraction of the circumference taken up by the arc outlining circle A’s sector is smaller than the fraction of the circumference taken up by the arc in circle B.

Match each arc length and radius with the measure of the central angle that defines the arc.

• 1: angle: 30 degrees