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| A triangle that contains only angles that are less than 90 degrees. |
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| The amount of rotation needed to bring one line or plane into coincidence with another, generally measured in radians or degrees. |
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| The number of square units required to cover a surface. |
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| 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. |
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| A 3D point where the total weight of the body may be considered to be concentrated. |
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| A 3D point defining the geometric center of a solid. |
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| A round plane figure whose boundary consists of points equidistant from the center |
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| 1. A triangle located round a polygon such as a circle. 2 To draw a figure around another, touching it at points but not cutting it. |
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| 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. |
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| The measure of mass density is a measure of mass per volume. |
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| A straight line passing from side to side through the center of a circle or sphere. |
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| 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 |
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| A curve formed at the interior intersection between two or more surfaces. |
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| To draw a figure within another so that their boundaries touch but do not intersect |
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| The amount of matter in an object or the quantity of the inertia of the object. |
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| The curved upper surface of a liquid column that is concave when the containing walls are wetted by the liquid and convex when not. |
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| A triangle with one angle that is greater than 90 degrees. |
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| A four-sided polygon with both pairs of opposite sides parallel. |
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| The numerical value of the ratio of the circumference of a circle to its diameter of approximately 3.14159. |
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| Any plane figure bounded by straight lines. |
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| The lines of intersection created from three mutually perpendicular planes, with the three planes’ point of intersection at the centroid of the part. |
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| A solid geometric figure whose two ends are similar, equal, and parallel rectilinear figures, and whose sides are parallelograms. |
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| A straight line from the center to the circumference of a circle or sphere. |
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| A parallelogram with 90 degree angles. A square is also a rectangle. |
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| A polygon with equal angles and equal sides. |
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| A triangle that has a 90 degree angle. |
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| Two or more exterior surfaces rounded at their intersections. |
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| A regular polygon with four equal sides and four 90 degree angles. |
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| The squared dimensions of the exterior surface |
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| A straight or curved line that intersects a circle or arc at one point only. |
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| 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. |
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| A polygon with three sides. |
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| Each angular point of a polygon, polyhedron, or other figure. |
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| The amount of three-dimensional space occupied by an object or enclosed within a container. |
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