# Algebra I Honors

Algebra I Honors

Vocabulary

Acute angle: A positive angle measuring less than 90 degrees

Additive inverse (opposite): The additive inverse of any number x is the number that gives zero when added to x. The additive inverse of 5 is -5

Area: The number of square units that covers a shape or figure

Circle: The set of points in a plane that are a fixed distance from a given point, called the center

Circumference: The boundary line of a circle

Complementary angles: Two angles whose sum is 90

Cone: A three-dimensional figure with one vertex and a circular base

Congruent: Figures or angles that have the same size and shape

Coordinate plane/system: The plane determined by a horizontal number line, called the x-axis, and a vertical number line, called the y-axis, intersecting at a point called the origin.

Coordinates of a point: Each point in the coordinate plane can be specified by an ordered pair of numbers

Cube: A solid figure with six square faces

Cylinder: A three-dimensional figure having two parallel bases that are congruent circles

Data: Information that is gathered

Decimal: The numbers in the base 10 number system, having one or more places to the right of a decimal point

Denominator: The bottom part of a fraction

Diameter: The line segment joining two points on a circle and passing through the center of the circle

Difference: The result of subtracting two numbers

Digit: The ten symbols, 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9. The number 215 has three digits: 2, 1, and 5

Coefficient: A constant that multiplies a variable

Prism: A solid figure whose bases or ends have the same size and shape and are parallel to one another, and each of whose sides is a parallelogram

Variable: A letter used to represent a number value in an expression or an equation

Right Angle: An angle whose measure is 90 degrees

Ray: part of a line, with one endpoint, and extending to infinity in one direction

Supplementary angles: Two angles are supplementary if their sum is 180 degrees

Simple Interest: Interest paid only on the original principal, not on the interest gained

Dividend: In a / b = c, a is the dividend

Divisible: Capable of being divided, especially with no remainder

Divisor: In a / b = c, b is the divisor

Edge: The line of intersection of two surfaces

Endpoint: Either of two points marking the end of a line segment

Equation: A mathematical statement that says that two expressions have the same value; any number sentence with an =

Exponent: A number that indicates the operation of repeated multiplication

Factor: One of two or more expressions that are multiplied together to get a product

Fibonacci sequence: The sequence of numbers, 1, 1, 2, 3, 5, 8, 13… in which each successive number is equal to the sum of the two preceding numbers

Formula: An equation that states a rule or a fact

Improper fraction: A fraction with a numerator that is greater than the denominator

Integer: The set of numbers containing zero, the natural numbers, and all the negatives of the natural numbers

Mixed number: A number written as a whole number and a fraction

Mode: A type of average; the number (or numbers) that occurs most frequently in a set of data

Numerator: The top part of a fraction

Obtuse angle: An angle whose measure is greater than 90 degrees

Parallel: Two lines are parallel if they are in the same plane and never intersect

Perimeter: The sum of the lengths of the sides of a polygon

Inequality: A mathematical expression which shows that two quantities are not equal

Surface area: For a three-dimensional figure, the sum of the areas of all the faces

Slope: The steepness of a line expressed as a ratio, using any two points on the line

Translation: A transformation, or change in position, resulting from a slide with no turn

Square: A quadrilateral with four equal sides and four 90 degree angles

Scientific notation: A method for writing extremely large or small numbers compactly in which the number is shown as the product of two factors

Prime factorization: The solution of an integer or polynomial into prime factors such that when multiplied together they give the integer or polynomial

Prime number: A number whose only factors are itself and 1

Probability: For an experiment, the total number of successful events divided by the total number of possible events

Product: The result of two numbers being multiplied together

Proportion: An equation of fractions in the form: a/b = c/d

Quotient: The answer to a division problem

Radius: The distance from the center to a point on a circle; the line segment from the center to a point on a circle

Remainder: The number left over when one integer is divided by another

Repeating decimal: A decimal in which the digits endlessly repeat a pattern

Sum: The answer to an addition problem

Triangle: A three-sided polygon

Volume: A measurement of space, or capacity

X-axis: The horizontal axis in a Cartesian coordinate plane

Y-axis: The vertical axis in a Cartesian coordinate system

Whole number: The set of numbers that includes zero and all of the natural numbers

Hypotenuse: The side opposite the right angle in a right triangle

Pythagorean Theorem: The theorem that relates the three sides of a right triangle:

Perpendicular: Two lines are perpendicular if the angle between them is 90 degrees

Polygon: A closed plane figure made up of several line segments that are joined together

Vertex: The point on an angle where the two sides intersect

Real number: The combined set of rational numbers and irrational numbers Quadrilateral: A polygon with 4 sides

Reflection: A transformation resulting from a flip

Square root: The square root of x is the number that, when multiplied by itself, gives the number, x