⭕ Circles
Circles hide beautiful angle rules. Drag the points and watch the angles stay in step!
🧠 The Big Idea
- The angle an arc makes at the centre is twice the angle it makes at any point on the circle.
- An angle in a semicircle (subtended by a diameter) is always 90° — a right angle, wherever you put the point!
- Angles in the same segment are equal. These rules power geometry proofs & constructions.