Circle Theorems

Table of Contents

• Theorem 1 Chord/radius

  • Theorem 1

• Theorem 2 Angle subtended by a chord at centre and circumference

  • Theorem 2

• Theorem 3 Angles subtended by the same chord (bowtie)

  • Theorem 3

• Theorem 5 Exterior angle of a cyclic quad

  • Theorem 5

• Theorem 4 opposite angles of a cyclic quadrilateral

  • Theorem 4

• Theorem 6 Tangent/radius

  • Theorem 6

• Theorem 7 Two tangents from common point

  • Theorem 7

• Theorem 8 Tangent/chord

  • Theorem 8