CIRCLES 1

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CIRCLES 1
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VOCABULARY Identify the name of the object
pictured in each frame.
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Center
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Radius
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Tangent
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Point of Tangency
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Secant
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Chord
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Diameter
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Concentric Circles
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Central Angle
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Inscribed Angle
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Inscribed Polygon
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Circumscribed Polygon
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Inscribed Circle
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Circumscribed Circle
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Intercepted Arc
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Minor Arc
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Semicircle
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Major Arc
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Angles Arcs
The measure of the angle depends mostly on where
its vertex lies. Is it inside the circle, on
the circle, or outside the circle?
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The measure of a minor arc is the same as
the measure of its central angle.
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The measure of an inscribed angle is
half the measure of its intercepted arc.
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The measure of an angle formed by a tangent and
secant is
half the measure of its intercepted arc.
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The measure of one of the vertical angles formed
by 2 intersecting chords
...is half the sum of the two intercepted arcs.
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The measure of an angle formed by 2 secants
intersecting outside of a circle is
half the difference of the measures of its two
intercepted arcs.
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The measure of an angle formed by 2 tangents
intersecting outside of a circle is
half the difference of the measures of its two
intercepted arcs.
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If a quadrilateral is inscribed in a circle then
each pair of opposite angles
...must be supplementary. (total 180o)
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Angles Arcs Find the measure of the
indicated object in each frame.
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88o
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x
25 o
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100 o
x
60 o
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x
130 o
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The End
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2
3
4
x
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2
3
4
X6
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10
x
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10
X10
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