Circle Theorems

Question 1

What are the 8 Circle Theorems

Answer 1

1. The angle in a semi circle is 90°
2. The angle at the circumference is half the angle at the centre
3. The angles in the same segment from a common chord are equal
4. The opposite angles in a cyclic quadrilateral always add up to 180°
5. The angle between a radius and a tangents is 90°
6. Alternate segment theorem - The angle begween the chord and the tangent is equal to the opposite angle inside the triangle
7. The tangents to a circle from tne same point will be equal length
8. The radius through the midpoint of a chord will bisect the chord at 90°.