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# IED Unit 5 Key Terms

TermDefinition
A triangle that contains only angles that are less than 90 degrees. Acute Triangle
The amount of rotation needed to bring one line or plane into coincidence with another, generally measured in radians or degrees. Angle
The number of square units required to cover a surface. Area
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. Axis
A 3D point where the total weight of the body may be considered to be concentrated. Center of Gravity
A 3D point defining the geometric center of a solid. Centroid
A round plane figure whose boundary consists of points equidistant from the center Circle
The measure of mass density is a measure of mass per volume. Density
A straight line passing from side to side through the center of a circle or sphere. Diameter
A shape generated by a point 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 Ellipse
A curve formed at the interior intersection between two or more surfaces. Fillet
To draw a figure within another so that their boundaries touch but do not intersect. Inscribe
The amount of matter in an object or the quantity of the inertia of the object. Mass
The curved upper surface of a liquid column that is concave when the containing walls are wetted by the liquid and convex when not. Meniscus
A triangle with one angle that is greater than 90 degrees. Obtuse Triangle
A four-sided polygon with both pairs of opposite sides parallel. Parallelogram
The numerical value of the ratio of the circumference of a circle to its diameter of approximately 3.14159. Pi (π)
Any plane figure bounded by straight lines. Polygon
The lines of intersection created from three mutually perpendicular planes, with the three planes’ point of intersection at the centroid of the part. Principal Axes
A solid geometric figure whose two ends are similar, equal, and parallel rectilinear figures, and whose sides are parallelograms. Prism
A straight line from the center to the circumference of a circle or sphere. Radius
A parallelogram with 90 degree angles. A square is also a rectangle. Rectangle
A polygon with equal angles and equal sides. Regular Polygon
A triangle that has a 90 degree angle. Right Triangle
Two or more exterior surfaces rounded at their intersections. Round
A regular polygon with four equal sides and four 90 degree angles. Square
The squared dimensions of the exterior surface Surface Area
A straight or curved line that intersects a circle or arc at one point only. Tangent
A table located in the 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. Also referred to as a title strip. Title Block
A polygon with three sides. Triangle
Each angular point of a polygon, polyhedron, or other figure. Vertex
The amount of three-dimensional space occupied by an object or enclosed within a container. Volume