unit 9: circles Flashcards
circle
the set of points in a plane at a given distance from a given point in that plane
center
the given point of a circle
the radius
the given distance of a circle
a radius
any segment that joins the center to a point of the circle
chord
a segment whose endpoints lie on a circle
secant
a line that contains a chord
diameter
a chord containing the circle’s center
tangent
a line in the plane of a circle that intersects the circle at only the point of tangency
the point of tangency
the point where the tangent intersects with the circle
sphere
the set of points in space at a given distance from the circle at the set of the set radius from the circle
congruent circles & spheres
circles or spheres that have congruent radii
concentric circles
circles in the same plane with the same center
concentric spheres
spheres with the same center
a polygon is inscribed in a circle, and…
the circle is circumscribed about the polygon
central angle
(of a circle): an angle with a vertex at the center
arc
an unbroken part of a circle
minor arc
the interior of the central angle; the degree of the central angle