Circle Vocabulary

The radius of a circle is

• The measurement from the center of a circle to an edge of the circle.
• The measurement around the circle
• The measurement from and edge of the circle to another edge through the center
• A line perpendicular to the diameter of the circle

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An arc is...

• A line that passes through the center and goes from edge to edge.
• A part of the circumference.
• A boat.
• A line that touches the circle once.

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The diameter of a circle is:

• The measurement around the circle.
• The distance from an edge of a circle to another edge.
• The distance from the center of the circle to an edge of a circle
• The distance from an edge of a circle to another edge through the center. 

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A tangent line of a circle is...

• It's diameter
• It's radius
• It's circumference
• A line that touches the circle only once

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Which best describes segment AB?

• chord
• secant
• tangent
• diameter

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A segment that has one endpoint at the center and the other endpoint on the circle is the __________.

• diameter
• chord
• radius
• secant

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How many degrees are in a semicircle?

• 90
• 180
• 270
• 360

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A segment whose endpoints lie on a circle is a _______.

• tangent
• chord
• diameter
• secant

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An angle whose vertex is the center of a circle is a(n) ______.

• inscribed angle
• acute angle
• obtuse angle
• central angle

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CCSS.HSG.C.A.2

A chord is a segment that connects ___________

• the center to the endpoint
• to one point outside the circle
• a central angle
• 2 endpoints of a circle

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