GCSE Maths (Edexcel)

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Triangle from a Diameter

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Geometry and Measures Properties and Constructions

Triangle from a Diameter

1:59 More Circle Theorems
Spec G10
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  • When a diameter and another point on the circumference of a circle form a triangle, the angle at the circumference is a right angle (90 degrees)
  • The angle at the center of a circle is twice the angle at the circumference subtended by the same arc
  • The angle at the center of a circle is 180 degrees
  • The angle at the circumference is half the angle at the center
  • The angle at the circumference is 90 degrees in this case
  • It is important to know and be able to prove this circle theorem

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