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31 Cards in this Set
- Front
- Back
arc |
A portion of the circumference of a circle |
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arc length |
The distance along the curved line making up the arc |
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center |
The given point from which all points on a circle are the same distance. |
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central angle |
The angle whose vertex is at the center of a circle and sides are two radii. |
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chord |
A line that links two points on a circle or curve. (pronounced "cord") |
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circle |
A line forming a closed loop, every point on which is a fixed distance from a center point. |
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circumscribed circle (of a triangle) |
Circumscribed literally means "to draw around". A circumscribed circle of a triangle for example is the circle that passes through all three vertices. Usually called the circumcircle. |
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cyclic quadrilateral |
Definition and properties of a quadrilateral inscribed in a circle. Sometimes called a cyclic quadrilateral |
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diameter |
The distance across a circle through its center point. |
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conic section |
a figure formed by the intersection of a plane and a right circular cone. Depending on the angle of the plane with respect to the cone, a conic section may be a circle, an ellipse, a parabola, or a hyperbola. |
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directrix |
a fixed line used in describing a curve or surface. |
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ellipse |
a regular oval shape |
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equidistant |
at equal distances. |
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focus (of a conic section) |
A special point used to construct and define a conic section. A parabola has one focus. An ellipse has two, and so does a hyperbola. A circle can be thought of as having one focus at its center. |
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hyperbola |
An hyperbola looks sort of like two mirrored parabolas, with the two "halves" being called "branches" |
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inscribed angle |
An inscribed angle is an angle formed by two chords in a circle which have a common endpoint. |
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inscribed quadrilateral |
An inscribed quadrilateral is any four sided figure whose vertices all lie on a circle. |
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inscribed circle |
An inscribed circle is the largest possible circle that can be drawn on the inside of a plane figure. |
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intercepted arc |
The intercepted arc is a section of the circumference of a circle. |
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locus of points |
The locus of points at a given distance from a given point is a circle whose center is the given point and whose radius is the given distance. |
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major arc |
A major arc is an arc of a circle having measure greater than 180 degrees |
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minor arc |
A minor arc is an arc of a circle having measure less than 180 degrees |
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Parabola |
a symmetrical open plane curve formed by the intersection of a cone with a plane parallel to its side. |
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Point of Tangency |
the point at which a line touches an ellipse or circle, assuming that the line only makes contact at one point. |
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Radian Measure |
A measure of a central angle given by the ratio of the arc length to the radius. |
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radius |
a straight line from the center to the circumference of a circle or sphere. |
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secant |
a straight line that cuts a curve in two or more parts |
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sector |
figure enclosed by two radii of a circle or ellipse and the arc between them |
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semicircle |
half of a circle |
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tangent |
a straight line or plane that touches a curve or curved surface at a point, but if extended does not cross it at that point |
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vertex |
In geometry, a vertex (plural: vertices or vertexes) is a point where two or more curves, lines, or edges meet |