## Unit 2.1 Vocab

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nagarwal94  on December 8, 2009

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# Unit 2.1 Vocab

 Acute Trianglea triangle that contains only angles that are less than 90 degrees
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#### 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
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
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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