Lesson 2.1 Key Terms
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Created by:
13ajoussef on March 16, 2012
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Description:
PLTW - IED
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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 | a straight line through a body or figure that satisfies certain conditions |
| 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 |
| 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 | (1) A hole consisting of two depths so that the top of the head of an inserted bolt or screw will be flush with the outside surface. (2) A bit for enlarging the upper part of a hole. |
| Cylinder | a surface generated by rotating a parallel line around a fixed line |
| Diameter | the length of a straight line passing through the center of a circle and connecting two points on the circumference |
| Ellipse | A regular oval shape, traced by a point moving in a plane so that the sum of its distances from two other points is constant, or resulting when a cone is cut by an oblique plane which does not intersect the base. |
| Extrusion | A modeling process that creates a three-dimensional form by defining a closed two-dimensional shape and a length. |
| Inscribe | draw within a figure so as to touch in as many places as possible |
| Mass | a body of matter without definite shape |
| Origin | the point (0,0) where the x-axis and the y-axis intersect in a coordinate plane |
| Parallelogram | a quadrilateral whose opposite sides are both parallel and equal in length |
| Pattern | a customary way of operation or behavior |
| Pi | The numerical value of the ratio of the circumference of a circle to its diameter of approximately 3.14159. |
| Plane | a level of existence or development |
| Polygon | a closed plane figure bounded by straight sides |
| Prism | a polyhedron with two congruent and parallel faces (the bases) and whose lateral faces are parallelograms |
| 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 | a single complete turn (axial or orbital) |
| Right Triangle | a triangle with one right angle |
| Rotation | the act of rotating as if on an axis |
| Round | any circular or rotating mechanism |
| Solid | of definite shape and volume |
| 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 | (geometry) a plane rectangle with four equal sides and four right angles |
| Surface Area | the extent of a 2-dimensional surface enclosed within a boundary |
| Tap | cut a female screw thread with a tap |
| Taper | the property possessed by a shape that narrows toward a point (as a wedge or cone) |
| Triangle | a three-sided polygon |
| Vertex | the point of intersection of lines or the point opposite the base of a figure |
| Volume | physical objects consisting of a number of pages bound together |
| 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 |
| Computer-Aided Design | Software that allows you to create engineering, architectural, and scientific designs |
| Geometric Constraint | Constant, non-numerical relationships between the parts of a geometric figure. Examples include parallelism, perpendicularity, and concentricity. |
| 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 |
| Three-Dimensional | Having the dimensions of height, width, and depth. |
| Two-Dimensional | Having the dimensions of height and width, height and depth, or width and depth only. |
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