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# IED_KeyTerms_Unit 5

Acute Triangle A triangle Less than 90 degrees
Angle The amount of rotation needed to bring in coincidence with another line measured in radians or degrees
Area The number of square units required to cover a surface
Axis An imaginary line through a body, about which it rotates.
Center of Gravity A 3D point where the total weight of the body may be considered to be concentrated
Centroid A 3D point defining the geometric center of a solid.
Circle A round plane figure whose boundary consists of points equidistant from the center.
Circumscribe A triangle located round a polygon such as a circle. To draw a figure around another.
Cylinder A solid composed of two congruent circles in parallel planes.
Density the measure of mass density is a measure of mass per volume.
Diameter A straight line passing from side to side through the center of a circle or sphere.
Ellipse A shape generated by a poi8nt moving in a plane so that the sum of its distances from two other points (the foci) is constant and equal to the major axis.
Fillet A curve formed at the interior intersection between two or more surfaces.
Inscribe To draw a figure within another so that their boundaries touch but do not intersect.
Mass The amount of matter in an object or the quantity of the inertia of the object.
Meniscus The curved upper surface of a liquid column that is concave when the containing walls are wetted by the liquid and convex when not.
Obtuse Triangle A triangle with one angle that is greater than 90 degrees.
Parallelogram A four-sided polygon with both pairs of opposite sides parallel.
Pi the numerical value of the ratio of the circumference of a circle to its idameter of approximately 3.14159, rounded to 3.14
Polygon Any plane figure bounded byt straight lines.
Principal Axis The lines of intersection created from three mutually perpendicular planes, with the three planes' point of intersection at the centroid of the part.
Prism A solid geometric figure whose two ends are similar, equal, and parallel rectilinear figures, and whose sides 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.
Right Triangle A triangle that has a 90 degree angle.
Round Two or more exterior surfaces rounded at their intersections.
Square A regular polygon with four equal sides and four 90 degree angles.
Surface Area The squared dimensions of the exterior surface.
Tangent A straight or curved line that intersects a circle or arc at one point only.
Title Block A table located int he bottom right-hand corner of an engineering drawing that identifies, in an organized way, all of the necessary information that is not given on the drawing itself.
Triangle A polygon with three sides.
Vertex Each angular point of a polygon, polyhedron, or other figure.
Volume The amount of three-dimensional space occupied by an object or enclosed within a container.
Created by: 1024061

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