Circle Theorems Calculator
Circle Theorems
- Inscribed Angle = ½ × Central Angle
- Angles in a semicircle = 90°
- Opposite angles in cyclic quadrilateral = 180°
- Tangent ⊥ Radius at point of contact
- Equal chords = Equal angles from center
Note: These theorems are fundamental to circle geometry and are used extensively in geometric proofs and constructions. All angles are measured in degrees.