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circle ellipse in which the two axes are of equal length radius the length of a line segment between the center and circumference of a circle or sphere Diameter the length of a straight line passing through the center of a circle and connecting two points on the circumference Chord a straight line connecting two points on a curve Arc part of a circle Central Angle an angle whose vertex is the center of the circle Inscribed Angle An angle whose vertex is on a circle and whose sides contain chords of the circle Tangent ratio of the opposite to the adjacent side of a right-angled triangle Secant ratio of the hypotenuse to the adjacent side of a right-angled triangle Circumference the size of something as given by the distance around it