Unit 2.1 Vocab
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nagarwal94 on December 8, 2009
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48 terms
Terms | Definitions |
|---|---|
 Acute Triangle | a triangle that contains only angles that are less than 90 degrees |
| Angle | the amount of rotation needed to bring one line or plane into coincidence with another, generally measured in radians or degrees |
| Area | the number of square units required to cover a surface |
| Axis | 1. an imaginary line through a body, about which it rotates. 2. an imaginary line about which a regular figure is symmetrically arranged. 3. a fixed reference line for the measurement of coordinates |
| Cartesian Coordinate System | a rectangular coordinate system created by three mutually perpendicular coordinate axes, commonly labeled X, Y, and Z |
| Chamfer | a small angles surface formed between two surfaces |
| Circle | the set of all points in a plane at a given distance from a given point in the plane |
| Circumscribe | points but no cutting |
| Computer-Aided Design or Computer-Aided Drafting (CAD) | 1. for design, the use of a computer to assist in the process of designing a part, circuit, building, etc. 2. for drafting, the use of a computer to assist in the process of creating, sorting, retrieving, modifying, plotting, and communicating a technical drawing |
| Counterbore | a cylindrical recess around a hole, usually to receive a bolt head or nut |
| Countersink | a conical-shaped recess around a hold, often used to receive a tapered screw |
| Cylinder | a solid composed of two congruent circles in parallel planes, their interiors, and all the line segments parallel to the axis with endpoints on the two circles |
| Diameter | a straight line passing from side to side through the center of a circle or sphere |
| 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 | 1. a manufacturing process that forms material through a shaped opening. 2. a modeling process that creates a three-dimensional form by defining a closed two-dimensional shape and a length |
| Geometric Constraint | constant, non-numerical relationships between the parts of a geometric figure. examples include parallelism, perpendicularity, and concentricity. |
| Inscribe | to draw a figure within another so that their boundaries touch but do not intersect |
| Mass | the amount of matter an object contains |
| 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 with one angle that is greater than 90 degrees |
| Origin | a fixed point from which coordinates are measured |
| Parallelogram | a quadrilateral polygon with opposite sides parallel |
| Pattern | a repeated decorated design |
| Pi | the numerical value of the ratio of the circumference of a circle to its diameter of approximately 3.14159 |
| Plane | a flat surface on which a straight line joining any two points would wholly lie |
| Polygon | a closed geometric figure in a plane formed by connecting line segments endpoint to endpoint with each segment intersecting exactly two others. Polygons are classified by the number of sides they have, such as a triangle has three sides, quadrilateral has four sides, and a pentagon has five sides |
| Prism | are parallelograms |
| Quadrilateral | a four-sided polygon |
| Radius | a straight line from the center to the circumference of a circle or sphere |
| Rectangle | a parallelogram with 90 degree angles. A square is also a rectangle |
| Regular Polygon | a polygon with equal angles and equal sides |
| Revolution | creating a 3D solid or surface by revolving a 2D shape about an axis |
| Right Triangle | a triangle that has a 90 degree angle |
| Rotation | turing around an axis or a center point |
| Round | a rounded exterior blend between two surfaces |
| Solid | a three-dimensional body or geometric figure |
| 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 | unoccupied area or expanse |
| Square | a regular polygon with four equal sides and four 90 degree angles |
| Surface Area | surfaces of a solid |
| Tap | to cut internal threads |
| Taper | gradual diminution of width or thickness in an elongated object |
| Three-Dimensional | having the dimensions of height, width, and depth |
| Triangle | a polygon with three sides |
| Two-Dimensional | having the dimensions of height and width, height and depth, or width and depth only |
| Vertex | each angular point of a polygon, polyhedron, or other figure |
| Volume | the amount of space occupied by a substance or object or enclosed within a container |
| Working Drawings | drawings that convey all of the information needed to manufacture and assemble a design |
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