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Apex Geometry Unit 7: Circles Quiz
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o o o o o o o o o o o o o o o o o o o o o o o o Circle vocabulary/definitions, ∠ relationships in Circles, Secant relationships in circles, and Circles on Coordinate Planes.
Terms in this set (20)
Circle
a 2D figure formed by a line that forms a closed loop, whose points are all equidistant from a fixed center point.
Center
the fixed point inside the circle; all points on circle are equidistant from circle center
Radius
distance from circle center to any point on the circle
Circumfrence
distance around circle, circle's perimeter, P = d x π
Area
area of the region enclosed by the circle, A = r² x π
Sector of a Circle
part of a circle's area
Arc
part of a circle's circumference
Measure of an Arc
measure (in degrees˚) = to the corresponding central ∠ with the same endpoints
Length of an Arc
the distance from 1 endpoint of the arc to the other endpoint
Chord
a segment that connects the endpoints of an arc (or linking 2 points on a circle)
Diameter
the distance of the chord that passes through the center of the circle, 2r
Central ∠
an angle whose vertex is located at the center and the 2 endpoints lie on the circle
Inscribed ∠
an ∠ that lies within a circle (vertex in circle's interior) and its 2 endpoints lie on the circle
Measure of an Inscribed Angle
½ the measure of the central ∠ with the same 2 endpoints
Intercepted Arc
an arc with endpoints on each side of the inscribed ∠
Concentric Circles
circles that have the same center point
Congruent Circles
circles with the same radius, same diameter
Interior of, Exterior of, On a Circle
Interior of: inside the circle
Exterior of: outside the circle
On a Circle: on the circle
Tangent
a line intersecting 1 point on the circle, tangent and radius are ⊥ bisectors
Secant
a line intersecting 2 points on the circle
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