Circles, Circumference, and Area

• Circle - the set of all points that are equal distance from a point that is called the CENTER
• Parts of a Circle

  A) Tangent

  B) Segment

  C) Chord

  D) Arc

  E) Diameter

  F) Sector

  G) Center

  H) Radius

  I) Secant

  J) Circumference

  
• Circumference - the distance around a circle (the perimeter of a circle)
• Chord - a line segment whose endpoints are on the circle
• Diameter - a chord that passes through the center of a circle
• Radius - a line segment that has one endpoint at the center and the other on the circle
• Pi - the ratio of a circle's circumference to its diameter

  
• Fraction and decimal value of a Pi

  A) 22/7

  B) 3.14

  
• Segment - a portion of a circle enclosed by a chord and an arc
• Sector - a portion of a circle is covered by two radii and an arc
• Tangent - a line that touches the circle at exactly one point and it never enters the circle's interior
• Secant - a line that passes through the circle, intersecting it in exactly two points
• Arc - part of circumference of a circle.