circle and other related terms

• circle is the set of all points on a plane at a given distance from a fixed point
• center is the point that is equidistant from all the points of a circle
• radius is the distance from any points of a circle
• diameter is the distance across the circle through its center
• chord a segment whose endpoints lies on the circle
• circumference is the distance around the edge of a cicle
• tanget to a circle is a line coplanar with the circle that intersects a circle at exactly one point
• point of tangency is the point at which the tanget intersects the circle
• secant is a line that intersects a circle of a two pair