Circle Vocabulary Flashcards
(24 cards)
circle
set of all points in a plane equidistant from a given point (the center)
radius
segment whose endpoints are at the center and a point on the circle
diameter
segment whose endpoints are on the circle and contains the center
congruent circles
circles with the same radius
concentric circles
coplanar circles with the same center
tangent
a line that intersects the circle in exactly one point
point of tangency
the point where the tangent and circle intersect
circumscribed
a figure (such as a triangle) drawn around another figure (such as a circle), touching it but at no points cutting it
inscribed
a figure (such as the center of a circle) inside another figure (such as a circle)
minor arc
a part of a circle that is less than 180 degrees
major arc
a part of a circle that is greater than 180 degrees
semicircle
1/2 a circle
180 degrees
chord
a segment whos endpoints are anywhere on the circle
central angle
an angle whose vertex is the center of a circle
the measure of the central angle is equal to the measure of its intercepted arc
arc length
distance in units of arc
adjacent arcs
share an endpoint
congruent arcs
arcs that have the same measure
congruent chords have…
congruent arcs
congruent arcs have…
congruent central angles
congruent central angles have…
congruent chords
if two chords are equidistant from the center…
the chords are congruent
inscribed angle
has a vertex on the circle and endpoints that are chords of the circle
intercepted arc
the arc that’s on the inside of the inscribed angle
secant
a line that intersects a circle in exactly 2 places
