Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

Normal Size Small Size show me how

Normal Size Small Size show me how

# Geometry

### Guide for First Test

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

Ratio | A ratio is the comparison of 2 numbers or quantities |

Compression Ratio | Volume of cylinder with piston at the bottom of its stroke to vol. when the piston is at the top of the stroke. |

Aspect Ratio | Ratio of the length (or span) of an airfoil to its width (or chord) |

Glide Ratio | Ratio of forward distance traveled to vertical distance descended |

Air/Fuel Ratio | Ratio of weight of air to weight of fuel in the mixture being fed to the engine |

Gear/Speed Ratio | It is the ratio of the angular velocity of the input gear to the angular velocity of the output gear. |

Proportions | Statement of equality between 2 or more ratios |

Percentage | Parts out of one hundred, represented by % |

Algebra | Branch of mathematics that uses letters or symbols to represent variables in formulas and equations |

PEMDAS | Please Excuse My Dear Aunty Sally |

BODMAS | Brackets, Operations, Division, Multiplication, Addition, and Subtraction |

Geometry | Branch of mathematics that deals with shapes, sizes, relative position of figures, and the properties of space. |

Acute Angle | Angle less than 90 |

Right Angle | 90 degree angle |

Obtuse Angle | Greater than 90 degrees |

Straight Angle | line or 180 degree angle |

Reflex Angle | Angle that surrounds any angle |

Adjacent Angles | |

Vertical Angles | |

Linear Pair | |

Complementary Angles | When the sum of 2 angles = 90°, they are called complementary angles |

Supplementary Angles | When the sum of 2 angles = 180°, they are called supplementary angles |

Units for Angles | Degrees, radians |

Area | Measurement of the amount of surface of an object |

Sector | The plane figure enclosed by two radii of a circle and the arc between them. |

Polygon | A polygon is an enclosed shape made up of straight lines. |

Regular Polygon | A regular polygon has all its sides and angles equal. |

Apothem | The line joining the center of a regular polygon to the mid point of any of its sides |

Volume | The amount of space contained within a solid |

Cube | Cube is a special type of rectangular solid |

Cylinder | Solid having the shape of a can, or length of a pipe, or a barrel |

Piston Displacement | Total volume (in cubic inches, cubic centimeters, or liters) swept by all of the pistons of a reciprocating engine as they move in one revolution of the crankshaft |

Sphere | Solid having the shape of a ball (constant D) |

Cone | Solid with base as a circle, and sides tapered to a point |

Surface Area of 3-D Solids | Sum of all the areas of the faces of a solid |

Polyhedrons | -They have flat polygonal faces, straight edges, and sharp corners on vertices -They are based on polygons -They have no curved faces |

Prisms | Prisms are simple polyhedrons that have identical polygon ends and flat parallelograms sides |

Pyramids | Pyramids are polyhedrons with a polygon base and sides meeting at a top point or apex |

Trigonometry | The branch of mathematics that studies relationships involving lengths and angles of triangles. |

Right Triangle | A triangles that has 90 degrees |

Oblique Triangle | A triangle that is not a right triangle. There are two kinds of oblique triangles: Acute (all its angles are less than 90, and Obtuse triangles (has one obtuse angle). |

Equilateral Triangle | All its sides and angles are equal |

Isosceles Triangle | Two sides are equal. Angles opposite to equal sides are equal |

Scalene Triangle | The three angles and sides are unequal |

Angle of elevation | Angle produced by an object which is higher than the fixed view... |

Angle of depression | Angle produces by an object which is lower to the perspective view. |

Created by:
jfernandohv