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Parts of a Circle
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Which of the following is the formula for the AREA of a circle?
πrr
2πr
2πd
πr
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What is BD?
Radius
Chord
Tangent
Secant
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A central angle measures 90 degrees. Must be true, Could be true, or Cannot be true?
Could be true
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What is a central angle?
an angle whose vertex is at the center of the circle
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A radius is a chord. Must be true, Could be true, or Cannot be true?
Cannot be true
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Okay!
A diameter is a chord. Must be true, Could be true, or Cannot be true?
Must be true
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A chord is a diameter. Must be true, Could be true, or Cannot be true?
Could be true
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Okay!
What is an arc?
the portion of a circle between 2 points on the circle
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What is AF?
Secant
Chord
Radius
Tangent
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Name the pictured part of the circle
Central Angle
Arc
Sector
Center
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Which label is a central angle?
m
x
w
y
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What is DG?
Radius
Tangent
Chord
Secant
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Okay!
What is a chord
a line segment whose endpoints are on the circle
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Which label is a chord that is not a diameter?
x
y
w
m
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Which of the following is the formula for the CIRCUMFERENCE of a circle?
2πr
πrr
2πd
πr
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Name the pictured part of the circle
Center
Sector
Arc
Central Angle
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Okay!
Name the pictured part of the circle
Diameter
Sector
Radius
Chord
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Okay!
What is JB?
Secant
Tangent
Chord
Radius
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Okay!
Name the pictured part of the circle
Chord
Radius
Diameter
Sector
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Okay!
Which label is a diameter?
x
y
w
m
Oops!
Okay!
Name the pictured part of the circle
Center
Arc
Sector
Central Angle
Oops!
Okay!
Name the pictured part of the circle
Central Angle
Center
Sector
Arc
Oops!
Okay!
Which label is a radius?
x
w
m
y
Oops!
Okay!
Name the pictured part of the circle
Diameter
Sector
Chord
Radius
Oops!
Okay!
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