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GC_Gunn flashcards
basic geometry terms
48
Mathematics
10th Grade
08/27/2013

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Term
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Definition
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Term
Two angles in a plane which share a common vertex and a common side but do not overlap.
Definition
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Term
The surface included within a closed figure, measured by the number of square units needed to cover the surface.
Definition
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Term
Point B is between points A and C if it is on the line segment connecting A and C.
Definition
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Term
circumference A complete circular arc.
Definition
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Term
line, or plane that divides a geometric figure into two congruent halves.
Definition
line segment
Term
Lying on the same line.
Definition
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Term
If the sum of the measures of two angles is 90°
Definition
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Term
connect two vertices (the corners) of a polygon and have all or part of the line go OUTSIDE the polygon,
Definition
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Term
A three dimensional figure with a single base tapering to an apex. The base can be any simple closed curve.
Definition
cone
Term
Exactly equal in size and shape. same length.
Definition
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Term
An additional geometric figure that is constructed to assist in solving a problem or producing a proof.
Definition
construction
Term
straight lines that connect every single vertex and your lines never go outside the polygon.
Definition
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Term
On the coordinate plane, the pair of numbers giving the location of a point (ordered pair). of a point (ordered triple).
Definition
coordinate
Term
Points or lines that all lie in the same plane.
Definition
Term
A three-dimensional geometric figure with parallel congruent bases. The bases can be shaped like any closed plane figure (not necessarily a circle) and must be oriented identically.
Definition
Term
measures things that are circular
Definition
Term
A line segment between two points on the circle or sphere which passes through the center.
Definition
Term
A straight line along which two faces of a solid meet. face A planar surface of a solid figure.
Definition
Term
The side of a right triangle opposite the right angle.
Definition
hypotenuse
Term
The geometric figure formed by two points.
Definition
line
Term
a pair of adjacent angles formed by intersecting lines
Definition
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Term
Part of a line between two points called endpoints.
Definition
line segment
Term
The point halfway between two given points.
Definition
midpoint
Term
An angle that has measure more than 90° and less than 180°.
Definition
obtuse angle
Term
one of the two pairs of equal angles formed when two straight lines intersect eachother
Definition
opposite angle
Term
two things directly across eachother
Definition
opposite rays
Term
Two or more straight coplanar lines that do not intersect
Definition
parallel
Term
The distance around the outside of a plane figure.the sides.
Definition
perimeter
Term
At a 90° angle.
Definition
perpendicular
Term
A flat surface extending in all directions.
Definition
plane
Term
The geometric figure formed at the intersection of two distinct lines.
Definition
point
Term
A closed plane figure for which all sides are line segments.
Definition
polygon
Term
A solid with no curved surfaces or edges. All faces are polygons and all edges are line segments.
Definition
polyhedron
Term
A statement accepted as true without proof.
Definition
postulate
Term
A solid with parallel congruent bases which are both polygons. The bases must be oriented identically.
Definition
prism
Term
argument that shows something (like a theorem) is true beyond any doubt.
Definition
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Term
A polyhedron with a polygonal base and lateral faces that taper to an apex.
Definition
Term
half the diameter
Definition
radius
Term
A part of a line starting at a particular point and extending infinitely in one direction.
Definition
ray
Term
A 90° angle.
Definition
Term
They are straight lines that are neither parallel, nor intersecting. They lie in different planes.
Definition
skew
Term
A three dimensional solid consisting of all points equidistant from a given point.
Definition
Term
Two angles that add up to 180°.
Definition
supplementary
Term
An assertion that can be proved true using the rules of logic.
Definition
Term
A corner point of a geometric figure.
Definition
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Term
line that goes up and down
Definition
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Term
An angle that has measure less than 90°
Definition
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