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78 Cards in this Set
- Front
- Back
Acute Angle |
An angle less than 90 degrees |
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Acute Triangle |
A triangle with three acute angles.
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Angle |
Two rays that share a common endpoint. |
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Arc |
Two points on the circle and the continuous part of the circle between the two points. |
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Central Angle |
An angle with its vertex at the center of the circle, and sides passing through the endpoints of an arc. |
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Bisects |
To divide a figure into two congruent parts. |
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Chord |
Any line segment whose endpoints are on a circle. |
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Circle |
The set of all points in a plane at a given distance from a given point in the plane. |
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Collinear |
Two or more points that lie on the same line. |
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Complementary Angles |
Two positive angles whose sum is 90 degrees |
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Concave Polygon |
A polygon with at least one diagonal outside of the polygon. |
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Concentric Circles |
Two or more coplanar circles sharing the same center. |
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Cone |
A solid (3-dimensional) object that has a circular base and one |
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Congruent |
Two geometric shapes that are the identical same size and same shape. |
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Congruent Circles |
Two or more circles having radii with the same length |
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Congruent Segments |
Two or more segments having the same measurement/length. |
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Convex Polygon |
A polygon with no diagonal outside of the polygon. |
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Coplanar |
Two or more points that lie on the same plane. |
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Cylinder |
A solid (three-dimensional object) with two circular bases and one curved side. |
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Decagon |
A polygon with ten sides |
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Definition |
A statement that clarifies or explains the meaning of a word or a phrase. |
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Degree |
A measure of an angle. |
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Diagonal |
A line segment that connects two |
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Diameter |
A chord of a circle also containing the circle's center. |
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Dodecagon |
A polygon with twelve sides. |
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Equiangular Polygon |
A polygon with angles having equal measure. |
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Equilateral Polygon |
A polygon with sides having equal length. |
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Equilateral Triangle |
A triangle with three sides of equal length.
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Hemisphere |
Half a sphere |
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Heptagon |
A polygon with seven sides. |
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Hexagon |
A polygon with six sides |
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Isosceles triangle |
A triangle with at least two sides of equal length. |
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Vertex Angle |
In an isosceles triangle, the angle between |
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Base |
In an isosceles triangle, the side located opposite the vertex angle. |
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Base Angles |
In an isosceles triangle, the two angles opposite the two sides of equal length. |
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Kite |
A quadrilateral with exactly two pairs of distinct, congruent, consecutive sides. |
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Line |
A straight arrangement of infinitely many points. |
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Linear Pair of Angles |
Two angles sharing a common side and a vertex and their non-common sides form a line. |
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Line Segment |
Two points and all the points between them that lie on the line containing the two points. |
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Major Arc |
An arc of a circle that is larger than a semicircle. |
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Midpoint |
The point on the segment that bisects the segment. |
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Nonagon |
A polygon with nine sides |
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Octagon |
A polygon with eight sides. |
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Obtuse Angle |
An angle whose measure is more than 90 degrees, but less than 180 degrees. |
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Parallelogram |
Any quadrilateral in which both pairs of opposite sides are parallel. |
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Parallel Lines |
Two coplanar lines that lie in the same plane and never intersect. |
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Pentagon |
A polygon with five sides.
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Perpendicular Lines |
Lines that intersect to form right angles. |
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Plane |
An undefined term that has length and width, but no thickness. It is a flat surface that extends forever. |
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Point |
An undefined term that is basic unit of geometry. |
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Polygon |
A closed figure in a plane, formed by connecting line segments endpoint to endpoint with each segment intersecting exactly two others. |
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Prism |
A polyhedron with two faces that are congruent and parallel polygons and whose other faces are parallelograms formed by segments connecting the corresponding vertices of the bases. |
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Protractor |
A geometry tool used to measure an angle.
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Pyramid |
A polyhedron with one face that is a polygon and whose other faces are triangles formed by segments that connect the vertices of the base to a point not on the base. |
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Quadrilateral |
A polygon with four sides. |
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Radius |
A segment from the center to a point on the edge of the circle. |
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Ray |
A part of a line that begins at a particular point and extends endlessly in one direction. |
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Regular Polygon |
A polygon that is both equilateral and equiangular |
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Rhombus |
Any equilateral parallelogram.
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Right Angle |
A ninety degree angle. |
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Right Triangle |
A triangle with one right angle. |
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Scalene Triangle |
A triangle with no sides of equal length. |
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Sphere |
The set of all points in space at a given distance from a given point. |
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Square |
A regular quadrilateral |
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Square |
An equilateral rectangle |
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Square |
An equiangular rhombus |
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Straight Angle |
An angle measuring 180 degrees. |
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Supplementary Angles |
Two positive angles whose sum is 180 degrees |
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Tangent |
A line that touches a circle at exactly one point. |
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Trapezoid |
A quadrilateral with exactly one pair of parallel sides. |
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Bases |
The parallel sides in a trapezoid |
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Base Angles |
In a trapezoid, a pair of angles that share a base as common side. |
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Triangle |
A polygon with three sides. |
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Undecagon |
A polygon with eleven sides |
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Vertical Angles |
Angles formed by two intersecting lines; they share a common vertex but not a common side. |
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Vertex |
The common endpoint for two rays that determine an angle |
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Vertex |
An endpoint of a side of a polygon. |
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Skew Lines |
Two nonparallel lines in space that do not intersect |