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# IED Unit 5 Key Terms

Term | Definition |
---|---|

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 four-sided polygon. | Quadrilateral |

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 |

A four-sided polygon. | Quadrilateral |