Math

• Circle:

  • Set of all points in a plane which are a given distance from a given point on the plane
• Chord:

  • Line segment that has its endpoints on the circle
• Radius:

  • Segment whose endpoints are the center and a point on the circle
• Tangent:

  • Line segment or ray that intersects a circle at exactly one point
• Central Angle:

  • Angle whose vertex is the center of the circle
• Secant:

  • Line that intersects a circle at exactly two points and contains a chord of a circle
• Major Arc:

  • Arc that is larger of the two arcs
• Minor Arc:

  • Arc that is smaller than a semicircle
• Common Tangent:

  • Line that is tangent to two circles in the same plane
• Inscribed Angle:

  • Angle whose vertex is on a circle and whose sides contain chords of the circle
• Tangent Line:

  • Line coplanar with the circle and intersects it in one and only one point
• External Secant Segment:

  • Part of a secant segment that is outside a circle
• Tangent and Secant Segments and rays that are contained in the tangent or intersect the circle in one and only one point are also said to be tangent to the circle
• Postulate on Tangent line:

  • At a given point on a circle, one and only one line can be drawn that is tangent to a circle
• The sides of the central angle of the circle is the vertex of the circle