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Acute Triangle

a triangle whose interior angles are all acute

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Angle

the space between two lines or planes that intersect

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Area

the extent of a 2-dimensional surface enclosed within a boundary

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Axis

a straight line through a body or figure that satisfies certain conditions

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Chamfer

two surfaces meeting at an angle different from 90 degrees

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Circle

ellipse in which the two axes are of equal length

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Circumscribe

to draw a geometric figure around another figure so that the two are in contact but do not intersect

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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

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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.

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Cylinder

a surface generated by rotating a parallel line around a fixed line

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Diameter

the length of a straight line passing through the center of a circle and connecting two points on the circumference

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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.

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Extrusion

A modeling process that creates a three-dimensional form by defining a closed two-dimensional shape and a length.

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Inscribe

draw within a figure so as to touch in as many places as possible

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Mass

a body of matter without definite shape

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Origin

the point (0,0) where the x-axis and the y-axis intersect in a coordinate plane

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Parallelogram

a quadrilateral whose opposite sides are both parallel and equal in length

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Pattern

a customary way of operation or behavior

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Pi

The numerical value of the ratio of the circumference of a circle to its diameter of approximately 3.14159.

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Plane

a level of existence or development

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Polygon

a closed plane figure bounded by straight sides

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Prism

a polyhedron with two congruent and parallel faces (the bases) and whose lateral faces are parallelograms

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Quadrilateral

a four-sided polygon

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Radius

the length of a line segment between the center and circumference of a circle or sphere

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Rectangle

a parallelogram with four right angles

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Regular Polygon

a polygon with all sides and all angles equal

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Revolution

a single complete turn (axial or orbital)

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Right Triangle

a triangle with one right angle

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Rotation

the act of rotating as if on an axis

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Round

any circular or rotating mechanism

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Solid

of definite shape and volume

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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.

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Space

the unlimited expanse in which everything is located

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Square

(geometry) a plane rectangle with four equal sides and four right angles

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Surface Area

the extent of a 2-dimensional surface enclosed within a boundary

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Tap

cut a female screw thread with a tap

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Taper

the property possessed by a shape that narrows toward a point (as a wedge or cone)

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Triangle

a three-sided polygon

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Vertex

the point of intersection of lines or the point opposite the base of a figure

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Volume

physical objects consisting of a number of pages bound together

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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

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Computer-Aided Design

Software that allows you to create engineering, architectural, and scientific designs

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Geometric Constraint

Constant, non-numerical relationships between the parts of a geometric figure. Examples include parallelism, perpendicularity, and concentricity.

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Numeric Constraint

A number value, or algebraic equation that is used to control the size or location of a geometric figure.

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Obtuse Triangle

a triangle that contains an obtuse interior angle

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Three-Dimensional

Having the dimensions of height, width, and depth.

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Two-Dimensional

Having the dimensions of height and width, height and depth, or width and depth only.

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