- Created by: DJSalt
- Created on: 02-03-17 16:08
Circle theorem 1
Angles at the centre are double the angle at the circumference
Circle theorem 2
Angles in a semi-circle are 90 degrees.
Circle theorem 3
Angles in the same segment are equal
Circle theorem 4
Opposite angles in cyclic quadrilaterals add up to 180 degrees
Circle theorem 5
Lengths of tangents are equal if from the same point
Circle theorem 6
The angle between the radius and the tangent is 90 degrees
Circle theorem 7
The angle between the tangent and chord is equal to the angle in the alternate segment. This is called alternate segment theorem.
Circle theorem 8
Radius may bisect the chord which can produce a right angle.