Learn to identify circles and parts of circles'

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Circles
Learn to identify circles and parts of circles.
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Circles
Vocabulary
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Circles
A circle can be named by its center using the
symbol. A circle with a center labeled C would
be named C. An unbroken part of a circle is
called an arc.
2 Types of arcs

• A minor arc of a circle is an arc that is shorter
  than half the circle and named by its endpoints.

• A major arc of a circle is an arc that is longer
  than half the circle and named by its endpoints
  and one other point on the arc.

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Circles
Example
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Circles
A radius connects the center with a point on a
circle.
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Circles
A secant is a line that intersects a circle at
two points.
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Circles
A central angle has its vertex at the center of
the circle.
central angle Ð JKL
A central angle is equal in measure to the arc it
intercepts.
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Circles
A chord connects two points on a circle. A
diameter is a chord that passes through the
center of a circle.
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Circles
A tangent is a line that intersects a circle at
one point.
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Circles
An inscribed angle has its vertex on the circle.
inscribed angle Ð MNP
An inscribed angle is equal to one-half the
measure of its intercepted arc.
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Circles
Lesson Quiz
Ð BAK
Ð DCE