Circle theorems

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  • Circle theorems
    • Bowtie rule
      • Angles in the same segment are equal
    • Center angle
      • Angle at center is twice angle at circumference
    • Angle in a semi circle
      • Angle in a semi circle is always 90° (angle subtended to the diameter is always a right angle)
    • Tangents
      • The angle where a tangent meets a radius is always 90°
      • Two tangents drawn from the same point are equal in length
        • Forms an isoceles triangle
    • Alternate segment
      • Angles that form a z shape are equal




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