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CIRCLE
CIRCLE
 A figure with no sides and angles.
 The whole circle is equal to 360 degrees.
PARTS OF A CIRCLE
• Center
• Diameter
• Radius
• Circumference
• Arc
• Semicircle
• Major Arc
• Minor Arc
• Chord
• Tangent
• Secant
• Sector
• Central Angle
• Inscribed Angle
CENTER
• It is equidistant from any part of the circle.
• It is named with a big letter.
DIAMETER
 A line that passes through the center.
 A diameter is a chord.
RADIUS (PLURAL- RADII)
 Half of the diameter.
CIRCUMFERENCE
 It is the total distance around a circle.
ARC
 Semicircle
 An arc that is half of the circle.
 Major Arc
 Greater than 180 degrees.
 Minor Arc
 Less than 180 degrees.
CHORD
 A line that DOES NOT passes through the
center.
 A chord is not a diameter.
TANGENT
 A line that touches ONE point of the circle.
 Point of Tangency
 The point where the line touches the circle.
 Point P
SECANT
 A line that touches TWO points in a circle.
 A secant can be a chord.
SECTOR
 The portion of a circle enclosed by two radii
and an arc.
CENTRAL ANGLE
 An angle formed by two radii of the circle.
INSCRIBED ANGLE
 An angle formed by two chords of the circle.
Parts of a Circle

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Parts of a Circle