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VOCAB words | definition |
---|---|
Chord | a segment whose endpoints lie on a circle |
Diameter | a chord that contains the center of a circle |
secant of a circle | a line that contains a chord |
tangent to a circle | a line that lies n the plane of a circle and that intersects the circle at exactly one point (point of tangency) |
circle | the set of all points in a plane at a given distance from a given point in the plane |
radius | a segment from a point on a circle or a sphere to the center |
congruent circles | circle with the same radius |
concentric circles | circles that lie in the same plane that share the same center |
inscribed angle | angle whose vertex lies on a circle and whose sides contain chords of the circle |
central angle | angle whose vertex is the center of a circle and whose sides contain radii of the circle |
circumference | distance around a circle, that is, the perimeter of a circle |
arc length | a fraction of the circumference of a circle defined by the arc. |
arc of a circle | two points on a circle and the continuous part of the circle between the two points |
semi-circle | an arc of a circle whose endpoints are the endpoints of a diameter |
minor arc | an arc of a circle whose length is less than the length of a semi-circle of the circle |
major arc | an arc of a circle whose length is greater than the length of a semi-circle of the circle |