# Algebra Terms

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Terms to memorize for Algebra I

### Mixed Number

the sum of a whole number and a fraction

### Line

straight line that has no width and no ends

part of a line

### Intersect

when two lines cross

### Point of Intersection

the place where two lines cross

### Parallel Lines

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

### Perpendicular

when two lines make square corners at the point of intersection

### Right Angles

the angles made by perpendicular lines

### Straight Angle

two right angles that forms a straight line back to back

### Acute Angle

an angle smaller than a right angle

### Obtuse Angle

an angle larger than a right angle

### Polygon

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

### Triangle

a polygon with 3 sides and vertices

### Quadrilateral

a polygon with 4 sides and vertices

### Pentagon

a polygon with 5 sides and vertices

### Hexagon

a polygon with 6 sides and vertices

### Heptagon

a polygon with 7 sides and vertices

### Octagon

a polygon with 8 sides and vertices

### Nonagon

a polygon with 9 sides and vertices

### Decagon

a polygon with 10 sides and vertices

### Undecagon

a polygon with 11 sides and vertices

### Dodecagon

a polygon with 12 sides and vertices

an indentation

### Concave Polygon

a polygon with an indentation

### Convex Polygon

any polygon without an indentation

### Equilateral Polygon

when all the sides of a polygon have the same length

### Equiangular Polygon

when all the angles of a polygon have the same measure

### Regular Polygons

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

### Tick Marks

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

### Right Triangle

a triangle with a right angle

### Acute Triangle

a triangle with angles smaller than 90 degrees

### Obtuse Triangle

a triangle with an angle that is greater than 90 degrees

### Equianglular Triangle

a triangle in which all the angles are the same measure

### Isoceles Triangle

a triangle that has at least two sides of equal length

### Equilateral Triangle

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

### Scalene Triangle

a triangle in which all sides are different

### Parallelogram

a quadrilateral that has two pairs of parallel sides

### Trapezoid

a quadrilateral that has exactly two parallel sides

### Rectangle

a parallelogram with four right angles

### Rhombus

an equilateral parallelogram

### Square

a rhombus with four right angles

### Perimeter

the measure around

### Radius

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

### Diameter

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

### Circumference

the perimeter of a circle

### Irrational Number

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

### Number

an idea that represents quantity

### Numeral

a symbol which represents the idea of a particular number

### Value

the number represented by a numeral

counting numbers

### Positive Real Numbers

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

### Zero

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

### Real Numbers

all the positive real numbers plus zero

### Negative Numbers

the negative counterparts of the positive real numbers

### Signed Numbers

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

### Symbol of Equality

the equal sign which indicates that two quantities are equal

### Symbol of Inequality

the unequal sign which indicates that two quantities are not equal

### Addend

the numbers added in an addition problem

### Sum

the result of an addition problem

### Minuend

the first number in a subtraction problem

### Subtrahend

the second number in a subtraction problem

### Difference

the result of a subtraction problem

### Factor

the numbers multiplied in a multiplication problem

### Product

the result of a multiplication problem

### Dividend

the first number in a division problem

### Divisor

the second number in a division problem

### Quotient

the result of a division problem

### Numerator

the number on the top of a fraction

### Denominator

the number on the bottom of a fraction

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