# Algebra Terms Set 1

## 69 terms · Terms to memorize for Algebra I

### Mixed Number

the sum of a whole number and a fraction

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### Line

straight line that has no width and no ends

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part of a line

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### Intersect

when two lines cross

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### Point of Intersection

the place where two lines cross

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### Parallel Lines

lines in the same plane that do not intersect and the distance between the lines is always the same

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### Perpendicular

when two lines make square corners at the point of intersection

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### Right Angles

the angles made by perpendicular lines

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### Straight Angle

two right angles that forms a straight line back to back

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### Acute Angle

an angle smaller than a right angle

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### Obtuse Angle

an angle larger than a right angle

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### Polygon

simple, closed, flat geometric figures whose sides are line segments and whose lines do not cross

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### Triangle

a polygon with 3 sides and vertices

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a polygon with 4 sides and vertices

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### Pentagon

a polygon with 5 sides and vertices

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### Hexagon

a polygon with 6 sides and vertices

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### Heptagon

a polygon with 7 sides and vertices

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### Octagon

a polygon with 8 sides and vertices

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### Nonagon

a polygon with 9 sides and vertices

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### Decagon

a polygon with 10 sides and vertices

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### Undecagon

a polygon with 11 sides and vertices

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### Dodecagon

a polygon with 12 sides and vertices

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an indentation

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### Concave Polygon

a polygon with an indentation

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### Convex Polygon

any polygon without an indentation

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### Equilateral Polygon

when all the sides of a polygon have the same length

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### Equiangular Polygon

when all the angles of a polygon have the same measure

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### Regular Polygons

when all the sides of a polygon are the same length and all the angles are the same measure

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### Tick Marks

marks used to denote sides and angles that have the same length and/or measure

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### Right Triangle

a triangle with a right angle

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### Acute Triangle

a triangle with angles smaller than 90 degrees

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### Obtuse Triangle

a triangle with an angle that is greater than 90 degrees

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### Equianglular Triangle

a triangle in which all the angles are the same measure

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### Isoceles Triangle

a triangle that has at least two sides of equal length

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### Equilateral Triangle

a triangle in which the length of all the sides are equal

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### Scalene Triangle

a triangle in which all sides are different

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### Parallelogram

a quadrilateral that has two pairs of parallel sides

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### Trapezoid

a quadrilateral that has exactly two parallel sides

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### Rectangle

a parallelogram with four right angles

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### Rhombus

an equilateral parallelogram

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### Square

a rhombus with four right angles

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### Perimeter

the measure around

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the distance from the center of the circle to the outside edge

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### Diameter

the distance from one side of a circle through the center to the other side

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### Circumference

the perimeter of a circle

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### Irrational Number

a number that would take an infinite number of digits to express

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### Number

an idea that represents quantity

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### Numeral

a symbol which represents the idea of a particular number

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### Value

the number represented by a numeral

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counting numbers

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### Positive Real Numbers

any number that can be used to describe a physical distance greater than zero

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### Zero

a number that can be used to describe a physical distance of no magnitude

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### Real Numbers

all the positive real numbers plus zero

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### Negative Numbers

the negative counterparts of the positive real numbers

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### Signed Numbers

numbers that are indicated with signs of postive or negative used in algebraic addition

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### Symbol of Equality

the equal sign which indicates that two quantities are equal

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### Symbol of Inequality

the unequal sign which indicates that two quantities are not equal

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the numbers added in an addition problem

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### Sum

the result of an addition problem

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### Minuend

the first number in a subtraction problem

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### Subtrahend

the second number in a subtraction problem

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### Difference

the result of a subtraction problem

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### Factor

the numbers multiplied in a multiplication problem

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### Product

the result of a multiplication problem

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### Dividend

the first number in a division problem

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### Divisor

the second number in a division problem

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### Quotient

the result of a division problem

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### Numerator

the number on the top of a fraction

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### Denominator

the number on the bottom of a fraction

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