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Definitions pg 293 A diameter of a circle is a chord containing the center. It is the longest chord. A radius of a circle is a segment from the center to a point on the circle. radius Radius = AO O A B Diameter = AB diameter What is the relationship between a radius and a diameter?
Identify if the following is a radius, diameter, or chord. BC EI FJ GD GF IF FH DA MK FM
pg 294 The interior of a circle is the set of all points of the plane whose distance from the center is less than the radius. (inside) Theexterior of a circle is the set of all points of the plane whose distance from the center is greater than the radius. (outside) O Exterior Interior
pg 294 A tangent line to a circle is a line in the plane of the circle that intersects the circle in exactly one point. The point where a circle and a tangent intersect is the point of tangency.
Tangents and Secants Tangents and secants are LINES. A tangent line intersects the circle at exactly ONE point. A secant line intersects the circle at exactly TWO points.