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# IED_KeyTerms_Unit 5

Question | Answer |
---|---|

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. |

Quadrilateral | A four-sided polygon. |

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. |

Quadrilateral | A four-sided polygon. |