Lesson 2.1
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47 terms
Terms | Definitions |
|---|---|
 acute triangle | a triangle whose interior angles are all acute |
| angle | the space between two lines or planes that intersect |
| area | the extent of a 2-dimensional surface enclosed within a boundary |
| axis | the center around which something rotates |
| cartesian coordinate system | a coordinate system for which the coordinates of a point are its distances from a set perpendicular lines that intersect at the origin of the system |
| chamfer | two surfaces meeting at an angle different from 90 degrees |
| circle | ellipse in which the two axes are of equal length |
| circumscribe | to draw a geometric figure around another figure so that the two are in contact but do not intersect |
| computer-aided design | software that allows you to create engineering, architectural, and scientific designs |
| countersink | a hole (usually in wood) with the top part enlarged so that a screw or bolt will fit into it and lie below the surface |
| counterbore | a cylindrical recess around a hole, usually to receive a bolt head or nut. |
| cylinder | a solid figure with two congruent and parallel circular bases |
| diameter | the length of a straight line passing through the center of a circle and connecting two points on the circumference |
| ellipse | a closed plane curve resulting from the intersection of a circular cone and a plane cutting completely through it |
| extrusion | something that bulges out or is protuberant or projects from a form |
| geometric constraint | constant, non-numerical relationships between the parts of a geometric figure. Examples include parallelism, perpendicularity, and concentricity. |
| inscribe | write, engrave, or print as a lasting record |
| mass | (often followed by 'of') a large number or amount or extent |
| numeric constraint | a number value, or algebraic equation that is used to control the size or location of a geometric figure |
| obtuse triangle | a triangle that contains an obtuse interior angle |
| origin | the point of intersection of coordinate axes |
| parallelogram | a quadrilateral whose opposite sides are both parallel and equal in length |
| pattern | a customary way of operation or behavior |
| pi | the ratio of the circumference to the diameter of a circle |
| plane | (mathematics) an unbounded two-dimensional shape |
| polygon | closed plane figure having, literally, many angles and therefore many sides |
| prism | optical device having a triangular shape and made of glass or quartz |
| quadrilateral | a four-sided polygon |
| radius | the length of a line segment between the center and circumference of a circle or sphere |
| rectangle | a parallelogram with four right angles |
| regular polygon | a polygon with all sides and all angles equal |
| revolution | the movement of an object around another object |
| right triangle | a triangle with one right angle |
| rotation | a single complete turn (axial or orbital) |
| round | having a circular shape |
| solid | a three-dimensional shape |
| solid modeling | a type of 3D CAD modeling that represents the volume of an object, not just its lines and surfaces. This allows for analysis of the object's mass properties |
| space | the unlimited expanse in which everything is located |
| square | a plane rectangle with four equal sides and four right angles |
| surface area | the total area of the 2-dimensional surfaces that make up a 3-dimensional object |
| tap | a light touch or stroke |
| taper | the property possessed by a shape that narrows toward a point (as a wedge or cone) |
| three-dimensional | having the dimensions of height, width, and depth |
| triangle | a three-sided polygon |
| two-dimensional | having the dimensions of height and width, height and depth, or width and depth only |
| vertex | the point of intersection of lines or the point opposite the base of a figure |
| volume | the amount of 3-dimensional space occupied by an object |
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