Properties of circle

Circle Geometry Properties

Calvin Lin contributed

Can you find the numerous circle properties in the image? Click on the link to learn more.

1. Radius is the same length: 
2. Angle at center is twice angle at circumference: .
3. Inscribed angle theorem: .
4. Thales' theorem: .
5. Alternate segment theorem: 
6. Perpendicular tangent theorem: .
7. Tangents to the circle from a point have the same length: .
8. Opposite angles in a cyclic quadrilateral: .