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Geometry words

46 Geometry words

Acute Angle An angle that is smaller than 90 digrees.
Angle The figure formed by two rays that meet at a common endpoint.
Center A point from which every point on a circle is the same distance.
Circle Asimple closed curve;all the points on the circle are the same distance from the center point.
Congruent Figures Figures that have same size and shape.
Degree A unit used to measure angles.
Diameter A line segment that passes through the center of a circle and has both end points on a circle.
Edge The line segment where two faces of a soild figure meet.
equilateral Triangle Atriangle whose three sides are congruent.
End Point The point at the end of a line segment or ray.
Intersecting Line Lines that meet or cross at a common point.
Isosceles Triagle Atriangle with at least two sides that are equal in length
Line A straight set of points that go on forever in opposite directions.
Obtuse Angle An angle that measures more than 90 digrees but less than 180.
Half- turn symmetery A figure that matches its image when its image when it is turned halfway around has half-turn symmetry.
Rectangular Prism A solid figure with six rectangular faces.
Slide (translation) The movement of a figure aloung a line without changing direction
Ray The part of a line that starts at an endpoint and goes on forever in one direction
Rectangle A parallelogram with four right angles
Perpendicular lines Intersecting lines in the same plane that form four right angles
Line Segment The part of a line between two endpoints
Radius A line segment with endpoints at the center of a circle and on the circle
Straight Angle An angle that measures 180 digrees
Trapezoid A quadrillateral with exactly one pair of parallel sides
SimilarFigures Figures that have the same shape.They may or may not be the same size
Vertex A common endpoint of two rays or line segment.In a soild figure,the point at witch three or more edges meet
Perimeter The distince around a shape
Square A parallelogram that has four right angles and four congruent sides
Rhombus An angle that measures 90 digrees.Itforms a square corner
Volume The number of cubic units needed to fill a soild figure
Square Pyramid A pyramid with a square base
Area The number of square units needed to cover a flat surface
Quadrillateral Any four-sided polygon
Sphere A solid figure that is shaped like a ball
Parallelogram A quadrilateral whoose opposite sides are parallel and congruent
Turn The movement of a figure around a point
Scalene Triangle A triangle with no sides that are equal
Point An exact location in space
Triangle A polygon with three sides
Parallel lines Lines in the same plane that never intersect
Polygon A simple closed flat figure made up of three or more line segment
Tiangular Prism A soild figure with two parallel triangular faces
Plane A flat surface that extends indefinitely in all directions
Right Triangle A triangle that has one right angle
Protractor The tool used to measure angles
Created by: cfreitas@stp