Diameter, A chord that passes through the center, Radius, Connects the center of a circle to the circle, Center, The point equidistant from all points on a circle, Chord, A segment that touches two sides of a circle, Secant, A line that passes through two sides of a circle, Tangent, A line that touches the circle in exactly one place, Point of Tangency, The point on the circle touched by a tangent line, Semi Circle, Half a circle, Major Arc, An arc greater than half a circle, Minor Arc, An arc smaller than half a circle, Central Angle, An Angle whose vertex is on the center, Inscribed angle, An angle whose vertex is on the circle, Intercepted arc, An arc formed by an angle in a circle, Circumference, Distance around a circle (an arc that is the whole circle), Circle, A set of points equidistant from a fixed central point., Tangent Circles, Circles that intersect at exactly one point., Concentric Circles, Two or more circles that share a center but have different radii., Equation of a Circle, (x - h)2 + (y - k)2 = r2, Area of a Circle, Circumference of a Circle, Sector Area, Arc Length

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