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ACT Math Vocab

TermDefinition
Acute Angles are less than 90 degrees. Triangle all angles are less than
Altitude the height of a triangle that makes a 90 degree angle
Arc Part of the circumference made by a wedge of a circle
Circumference The distance around a circle. Given by c=2pir
Coefficient The number in front of a variable
Congruent Equal to
Consecutive One after the other like 3,4,5
Diagonal the line between non-consecutive corners in a polygon
Diameter The distance across a circle through the center
Difference the result when you subtract numbers
Equilateral All sides are equal
Hexagon sixed sided shape
Inequalities any expression that includes: <,>
Integer Any real numbers that doesn't have fraction or decimals including 0 and all negative "whole numbers"
Isosceles A triangle with at least 2 sides and 2 congruent angles
Maximum The highest y-value of a graph
Median The middle number when the numbers are in order
Midpoint The point exactly halfway between two other points
Minimum The lowest y-value of a graph
Mode The most frequently listed number
Obtuse Angle greater than 90 degrees
Origin the point (0,0), usually marked with O
Parabola A U-shaped graph that has an equation with an x2
Parallel Lines that don't intersect because they have the same slope
Pentagon A five-sided polygon
Perimeter The distance around the outside of a shape
Perpendicular Lines that make 90 degree angles when they meet
Polygon A shape
Product The result when you multiply numbers
Quadrilateral A four-sided polygon
Quotient The result when you divide numbers
Radius The distance from any point on the circle to the center
Real numbers Every number that doesn't have an "i" in it.
Reflection Flipped over
Remainder The amount left over when you divide
Rhombus A quadrilateral with equal sides
Right Referring to an angle right mean 90 degrees
Scalene A triangle with all different sides and angles
Sum The result when you add numbers
Symmetric The same on one side as it is on the other side
Translation To move a line segment or entire graph horizontally or vertically
Vertex A corner of a shape
Adjacent Means next to
Arithmetic Sequence Each term comes from adding a fixed number to each term
Binomial A polynomial with 2 terms
Bisect Cuts into 2 equal segments or angles
Chord Joins any 2 points on a circle
Complex numbers Numbers made up of real and imaginary numbers
Constant A number
Digit Ony numbers 0-9
Directly Proportional y=kx, where k is a constant
Domain All possible x- values of a graph
Equidistant Same distance away
Equivalent to Just simplify or evaluate the given equation
Expression pieces of an equation
Exterior angle The angle formed by extending one of the sides of a polygon
Function equation that starts with f(x)
Geometric Sequence Each term comes from multiplying the previous term by a fixed number
Hypotenuse Longest side of a right triangle
Imaginary numbers Number that includes "i", Square roots of negative numbers
Interior angle The angles on the inside of a polygon
Period The distance a wave travels before it repeats its pattern
Polynomial Has terms with x, x2, x3
Prime A number that has exactly 2 factors
Probability A fraction with number of successful ways on the top and total on the bottom
Quadrant Parts of the xy plane on a graph
Radians Angles can be measured in this
Range All of the possible y-values of a graph
Ratio Think of a ratio as a fraction on ACT (4:7 as 4/7)
Slope Rise over run
Straight angle A angle formed by a straight line. Equals 180 degrees
Surface Area 3d shapes, sum of the areas of all the faces
Transversal A line that intersects two or more other lines
Trapezoid Quadrilateral with exactly 2 parallel sides. Area of a trapezoid (B1+B2/2)xH
Created by: angie_1181
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