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# Unit 1 Vocabulary

### math

TermDefinition
line Most students know what a line is but it is important to note that a line has arrows in both directions, note it is different from a line segment that terminates with end points.
line segment A part of a line that terminates with a point at either end.
ray A mix between a line and a line segment, one end has a point, the other end an arrow.
Plane Think of a desktop that continues infinitely in all directions.
Co-linear Points that are co-linear would be points that fall on the same line.
Midpoint This is the exact middle of a line segment, it divides something into two equal halves. The formula for calculating a midpoint doesn't need to be memorized if you just remember that it is the average of the x-values and the average of the y-values.
Acute angle A "cute" small angle that is greater than 0 degrees but less than 90 degrees.
Right angle An angle that is exactly 90 degrees.
Obtuse angle An "obese" angle or fat angle, one that is greater than 90 but less than 180.
Straight angle A angle that forms a line and measures 180 degrees.
Complementary Two angles who sum to 90 degrees.
Supplementary Two angles who sum to 180 degrees.
Adjacent angles Angles that are next to each other.
Linear Pair Two adjacent angles that are supplementary.
Bisect Something that cuts into two equal pieces such as an angle bisector would cut the angle into two equal pieces.
Vertical angle Angles opposite each other (often form an X) - vertical angles are complementary.
Perpendicular Bisector Something that cuts into two equal pieces such as an angle bisector would cut the angle into two equal pieces.
Distance between two points Memorize distance formula or learn how to use the Pythagorean Theorem to find the distance between any two ordered pairs.
Perimeter Distance around an object.
Area the space inside a shape
Radius The distance from pne side from the center of the circle the one end of the circle. Radius is half the diameter
Diameter The distance from one side of a circle to the other going through the center of the circle. Diameter is twice the radius.
Addition property of Equality When you add the same number to both sides of an equation, it doesn't effect the equality of the equation.
Subtraction property of Equality When you subtract the same number from both sides of an equation, it doesn't effect the equality of the equation.
Multiplication Property of Equality When you multiply the same number to both sides of an equation, it doesn't effect the equality of the equation.
Division Property of Equality
Created by: seals33

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