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# Math Unit 1-4 Vocab

### Apex Vocabulary; 7th grade

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

Scale Drawing | A drawing that represents a real object. The scale factor gives the ratio of the lengths in the scale drawing to the lengths in the real object. |

Scale Factor | A factor that gives the ratio of a side length in a scale drawing to the matching side length in the real object. |

Acute Angle | An angle that is less than 90 degrees. |

Angle | An object formed by two rays that share the same endpoint. |

Ray | A line. |

Obtuse Angle | An angle that is more than 90 degrees. |

Protractor | A tool used to measure angles. |

Right Angle | An angle that is 90 degrees. |

Right Triangle | A triangle with a 90 degree angle. |

Vertex | The point where rays meet to form an angle. |

Vertices | Plural form of vertex. |

Solid | An object that has three dimensions: length, width, and height. Also called a solid figure or a three-dimensional figure. |

Cross Section | The figure that results when a plane is passed through a solid. |

Plane | A flat surface that extends forever in all directions. A plane has no thickness, so it has only two dimensions. |

Right Rectangular Prism | A three-dimensional solid consisting of two parallel and congruent rectangular bases and all the points in between them. |

Right Rectangular Pyramid | A three-dimensional solid consisting of a rectangular base, a vertex, a vertex that is perpendicular to the base, and all points in between them. |

Area | The size of a surface. Area is measured in square units (u^2). Variable letter is a. |

Formula for Area | A=pi*r^2 |

Center of the Circle | The point in the exact center of the circle. All of the points are the same distance from the center. |

Circle | A closed curve with all its points the same distance from the center. |

Circumference | The measure of the distance around the perimeter of a circle. Circumference is measured in linear units. Variable letter is c. |

Formula for Circumference | C=pi*d |

Diameter | A line segment that runs passes through the center of a circle and has endpoints on the circle. The length of the diameter is equal to twice the amount of a radius in a circle. Variable letter is d. |

Pi | The ratio of the Circumference of any circle to its diameter. It is approximately 3.14. |

Radius | A line segment that goes from the center to any point. It equals half of the diameter. |

Adjacent Angles | Angles that share a vertex. |

Complementary Angles | Two angles whose measurements have a sum of 90 degrees. If two are adjacent, they form a 90 degree angle. |

Linear Pairs | A pair of adjacent angles whose measures have a sum of up to 180 degrees. Linear pairs of angles are supplementary. |

Straight Angle | A 180 degree angle. |

Supplementary Angles | Two angles whose measurements have a sum of 180 degrees. If they are put together, they form a straight angles. |

Vertical Angle | A pair of opposite angles formed by supplementary lines. They are congruent. |

Composite Figure | A figure made up of two or more shapes. |

Composite Solid | A solid made up of two or more shapes. |

Net | A two-dimensional drawing that can be folded up to make a solid. The net shows all of the flattened surfaces of the solid. |

Quadrilateral | A four-sided two-dimensional figure. |

Parrallelogram | A quadrilateral with two pairs of parallel and equal sides. |

Surface Area | The total area of the exterior surface of a solid figure. |

Unit Square | A square where each side is one unit long. |

Volume | The amount of space in a three-dimensional object. |

Proportion | An equation stating that two ratios are equal. |

Rate | A ratio that compares two quantities that have different numbers. |

Ratio | A fraction. |

Unit Rate | A fraction of the amount of one measurement to one unit of another measurement term. |

Proportional Quantities | Quantities that are always in the same ratio. |

Constant of Proportionality | The constant that relates the variables in a direct variation. |

Absolute Value | The numbers distance from zero. Always positive, expressed as |n|. |

Additive Inverse | The opposite of a number. |

Opposite Numbers | Two numbers that are opposite in sign but have the same magnitude. |

Commutative Property of Addition | A rule stating in which order two numbers are added does not change the result. |

Associative Property of Addition | A rule stating that the grouping if numbers being added won't change the result. |

Distributive Property | A rule stating that when you multiply a number by the sum of two or more numbers, the result is the same as adding the two to get the whole number |