## Prentice Hall Mathematics Vocab ch.1

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KNaim38  on January 3, 2012

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# Prentice Hall Mathematics Vocab ch.1

 Acute AngleAn angle whose measure is between 0 and 90
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#### Definitions

Acute Angle An angle whose measure is between 0 and 90
Adjacent Angles Two coplanar angles that have a common side and a common vertex but no common interior points
Angle Formed by two rays with the same endpoint. The rays are the sides of the angle and with the common endpoint is the vertex of the angle.
Angle Bisector A ray that divides an angle into two congruent angles.
Axiom An accepted statement of fact.
Collinear Points Points that lay on the same line.
Compass A geometric tool used to draw circles and parts of circles, called arcs.
Complementary Angles Two angles whose sum equals 90
Congruent Angles Angles that have the same measure
Congruent Segments Segments that have the same length.
Conjecture A conclusion reached by using inductive reasoning.
Construction A geometric figure made with only a straightedge and a compass.
Coordinate The distance and direction from the origin of a number line. The coordinates of a point on a coordinate plane are in the form where x is the x-coordinate and y is the y-coordinate.
Coplanar Figures in the same plane.
Counter example A particular example or instance of the statement that makes the statement false.
Foundation Drawing A drawing that shows the base of a structure and the height of each part
Inductive Reasoning A type of reasoning that reaches conclusions based on a pattern of specific examples or past events.
Isometric Drawing A drawing of a three-dimensional object shows a corner view of a figure.
Line A series of points that extend in two directions without end.
Midpoint A point that divides the segment into two congruent segments.
Net A two-dimensional pattern that you can fold to form a three-dimensional figure.
Obtuse Angle An angle whose measure is between 90 and 180.
Opposite Rays Collinear rays with the same endpoint. They form a line.
Orthographic Drawing The top view, front view and right-side view of a three-dimensional figure.
Parallel Lines Lines that lie in the same plane and do not intersect.
Parallel Planes Planes that do not intersect
Perpendicular Bisector A line, segment, or ray that is perpendicular to the segment at its midpoint.
Perpendicular Lines Lines that intersect and form right angles.
Plane A flat surface that has no thickness. Contains many lines and extends without end in the directions of its lines.
Point A location.
Postulate An accepted state of fact
Ray The part of a line consisting of one endpoint and all the points of the line on one side of the endpoint.
Right Angle An angle whose measure is 90.
Segment The part of a line consisting of two points, called endpoints and all the points between them.
Skew Lines Lines that do not lie in the same plane.
Space The set of all points.
Straight Angle An angle whose measure is 180.
Straightedge A ruler with no markings on it.
Supplementary Angles Two angles whose sums equal 180.
Vertical Angles Two angles whose sides form two pairs of opposite rays.

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