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Math Circle Vocabulary
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Gravity
Terms in this set (27)
ARC
Part of a circle or a curve.
Arc length
The _____________________ of a circle is the product of the ratio and the circumference of the circle.
portion of the circumference of a circle
Center of a circle
the point inside a circle that is the same distance from all the points on the circle
CENTRAL ANGLE
An angle whose vertex is the center of the circle.
CHORD (a)
a segment whose endpoints are on the circle.
CIRCLE (c)
The set of all points in a plane that are the equal distance from a given point
(the center)
CIRCUMFERENCE (f)
The distance around a circle.
DIAMETER
A segment that contains the center of a circle and whose endpoints are on the circle. The term can also mean the length of this segment.
A chord that passes through the center of a circle.
A straight line passing from side to side through the center of the circle or Sphere.
Great circle
the intersection of a sphere and a plane that contains the center of the sphere
Hemisphere
half of a sphere
INSCRIBED ANGLE (e)
an angle is ___________ in a circle if the vertex of the angle is on the circle and the sides of the angle are chords of the circle.
Intercepted arc
the arc that lies in the interior of an inscribed angle and has endpoints on the angle.
MAJOR ARC (i)
An arc that is larger than a semicircle
part of a circle that measures from 180 to 360
MINOR ARC (h)
An arc that is smaller than a semicircle.
part of a circle that measures less than 180 degrees.
RADIUS
A Segment that has one endpoint at the center of a circle and the other endpoint on the circle. The term ____________ can also mean the length of this segment.
The distance from the center of a circle to any point on the circle.
SECANT (b)
a line, ray, or segment that intersects a circle at two points.
a line that intersects a circle in two points
Sector of a circle
the region bounded by two radii of the circle and their intercepted arc
SEMICIRCLE
Half a circle.
An arc with endpoints that are the endpoints of a diameter of a circle.
The measure of a ______________________ is 180 degrees.
Sphere
The set of all points in a three dimensional space that are the same distance from a fixed point, called the center
TANGENT (j)
A line, segment, or ray in the plane of the circle that intersects the circle in exactly one point.
Center of a sphere
The point inside a sphere that is the same distance from every point on the sphere.
diameter of a sphere
A chord that contains the center of the sphere
radius of a sphere
a segment from the center to a point on the sphere
RADIUS
A segment that has one endpoint at the center of a circle and he other endpoint on the circle. The term _________ can also mean the length of this segment.
CONGRUENT CIRCLES (d)
Circles whose radii are Congruent to each other.
CONCENTRIC CIRCLES (g)
Circles that lie in the same plane and have the same center.
vertex
A point where two or more straight lines meet.
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