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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 |
Created by:
AJ M
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