Diameter Diameter- A chord that contains the center of a circle. C
Tangent Tangent- A line in the plane of a circle that intersects the circle in exactly one point. C T
Point of Tangency Point of Tangency- The point (T)where a tangent intersects a circle. C T
Sphere Sphere- A sphere with center O and radius R is the set of all points in space at a distance R from point O
Congruent Circles (or spheres)- Congruent Circles (or spheres)- Circles (or spheres) that have congruent radii. C 3 D 3
Concentric Circles Concentric Circles- Circles that lie in the same plane and have the same center. C
Concentric Spheres Concentric Spheres- Spheres that have the same center.
Inscribed/Circumscribed Inscribed- A polygon is inscribed in a circle when each vertex of the polygon lies on the circle. Circumscribed- A circle is circumscribed about the polygon when each vertex of the polygon lies on the circle.