The geometry content of these pages target the high school level. It is possible that students of other levels will be successful, too!
Circle 1: Explore four points on the circumference of a circle that are joined and the 4 angles they define.
Circle 2: Explore the relationship between an angle and the other two angles of a triangle inscribed in a circle.
Circle 3: Explore four points on the circumference of a circle that are joined and the 2 angles they define.
Circle 4: Explore the relationship between the angle whose vertex is on the circle and the angle whose vertex is at the circle’s center.
Circle 5: Explore the angle between 2 chords and a tangent.
Circle 6: Explore the angle formed by tangent and chord.
Circle 7: Explore tangents to a circle.
Ellipse: Stop and start this animation to explore this conic.