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Math Unit 1-4 Vocab

Apex Vocabulary; 7th grade

TermDefinition
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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