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43 Cards in this Set
- Front
- Back
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most basic building block of geometry. Has no size, has only location.
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Point
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straight, continuous arrangement of infinitely many points. Infinite length, but no thickness.
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Line
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like a flat surface that extends infinitely along its length and width. has length and width, but no thickness.
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Plane
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3 undefined terms of geometry
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Point, Line, Plane
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statement that clarifies or explains the meaning of a word or phrase.
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Definition
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on the same line.
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Collinear
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on the same plane
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Coplanar
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consists of 2 endpoints. All points in between endpoints are collinear.
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Line Segment
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2 points at beginning and end of line segment.
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Endpoints
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2 segments that have equal measures or lengths.
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Congruent
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point on the segment that is the same distance from both endpoints.
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Midpoint
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divides the segment into 2 congruent sections.
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Bisects
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begins at a point and extends infinitely in one direction.
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Ray
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Midpoint Formula
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M(x+x)/2,(y+y)/2
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formed by 2 rays that share a common endpoint, provided that the 2 rays are noncollinear.
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Angle
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the commons endpoint of the 2 rays of an angle.
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Vertex
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the 2 rays of an angle.
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Sides
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the smallest amount of rotation about the vertex from one ray to the other, measured in degrees. Any value between 0 degrees and 180 degrees.
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Measure of an Angle
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a unit of measure for angles and arcs equivalent to 1/360 or a rotation around a circle.
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Degree
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the largest amount of rotation less that 360 degrees about the vertex from one ray to the other, measured in degrees.
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Reflex Measure of an Angle
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a tool used to measure the size of an angle in degrees.
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Protractor
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Equal in measure/shape/size.
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Congruent
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a ray that has its endpoint at the vertex of the angle and that divides the angle into 2 congruent angles.
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Angle Bisector
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angle formed between path of approaching object and surface from which it rebounds.
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Incoming Angle
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angle formed between path of rebounding object and surface it collided with.
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Outgoing Angle
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an example that shows a conjecture to be incorrect or a definition to be inadequate.
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Counterexample
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lines in the same plane that never meet.
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Parallel Lines
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lines that meet at 90 degree angles.
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Perpendicular Lines
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lines that aren't in the same plane and do not intersect.
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Skew Lines
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an angle that has a measure of 90 degrees.
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Right Angle
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an angle that has a measure of less that 90 degrees.
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Acute Angle
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an angle that has a measure of greater than 90 degrees.
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Obtuse Angle
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2 angles whose measures add up to equal 90 degrees.
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Complementary Angles
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2 angles whose measures add up to equal 180 degrees.
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Supplementary Angles
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2 angles that are opposite each other when 2 lines cross and share the same vertex.
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Vertical Angles
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2 angles that are adjacent and whose measures add up to equal 180 degrees. Are always supplementary and adjacent.
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Linear Pair of Angles
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a closed figure in a plane, formed by connecting line segments endpoint to endpoint with each segment intersecting exactly 2 others.
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Polygon
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each line segment of a polygon.
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Side
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each endpoint where the sides of a polygon meet.
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Vertex
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a line segment connecting 2 nonconsecutive vertices of a polygon or polyhedron.
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Diagonal
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a polygon in which no diagonal is outside the polygon.
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Convex
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a polygon in which at least 1 diagonal is outside the polygon.
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Cocave
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polygons that are the same shape and size.
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Congruent
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