Circle Vocab

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"the set of points equidistant to the center"

• center

• circle
• Diameter

• circumference

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"the point in the middle"

• center

• diameter

• radius

• circumference

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"halfway across the circle"

• circumference
• diameter
• radius
• sector

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"all the way across the circle - passes through the center"

• diameter
• area

• radius
• circumference

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"an angle whose vertex is at the center"

• obtuse angle
• right angle
• acute angle
• central angle

Tags

CCSS.4.G.A.1

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"an angle whose vertex is ON the circle (the entire angle is written inside the circle)"

• reflex angle
• explementary angle
• central angle
• inscribed angle

Tags

CCSS.HSG.C.A.2

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"a line that passes through a circle"

• secant
• diameter
• tangent
• chord

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"a line that touches a circle at one point"

• tangent
• diameter
• chord
• secant

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"an arc greater than 180"

• Major Arc

• Minor Arc

• obtuse angle
• acute angle

Tags

CCSS.HSG.C.B.5

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"An arc that is less than 180 degrees"

• full arc
• semi-circle
• major arc
• minor arc