Acute Angle An angle whose measure is less than 90° .

Acute Triangle A triangle with all three angles less than 90° .

Altitude of a Triangle A perpendicular line from a vertex to the side opposite that vertex.

Angle The figure formed by 2 rays or 2 line segments with a common endpoint called a vertex.

Angle Bisector A line that divides an angle into two equal parts.

Arc A part of the circumference of a circle.

Area The number of square units required to cover a surface.

Average The mean of a set of numbers found by dividing the sum of the numbers by the number of numbers.

Axes The intersecting number lines on a graph. The axes are used for reference in locating points.

B

Bar Graph A graph that uses bars to represent data visually.

Base (of a polygon) Any side may be called the base.

Base (of a power) The number used as the factor for repeated multiplication: 6³ - Base is 6.

Binary System A number system that consists of the two digits 0 & 1.

Bisector A line that divides a figure into two congruent parts.

Broken - Line Graph a graph that represents data, using line segments joined end to end.

Capacity The greatest volume that a container can hold, usually measured in litres or millilitres.

Chord a line segment that joins 2 points on the circumference of a circle.

Circle A closed figure with all of its points the same distance from the centre.

Circle Graph A graph that uses sectors of a circle to show how data is divided into parts by percent.

Circumference The perimeter of a circle.

Common Denominator A number that is a common multiple of the denominators of a set of fractions.

Common Factor A number that is a factor of two or more numbers.

Common Multiple A number that is a multiple of two or more numbers.

Complementary Angles Two angles whose sum is 90° .

Composite number A number that has more than 2 different factors.

Computer spreadsheet A computer application that stores information

Congruent Figures Figures with the same size and shape.

Coordinate Plane The 2-dimensional or (x,y) plane. Also known as the Cartesian plane.

Coordinates In ordered pair(x,y) that locates a point on a graph.

Corresponding Angles Angles that have the same relative position in geometric figures.

Corresponding Sides Side that have the same relative position in geometric figures.

Cube A polyhedron with 6 congruent square faces.

Data Facts or information.

Database An organized and sorted list of information, which is usually generated by a computer.

Decagon A polygon with 10 sides.

Decahedron A polyhedron with 10 faces.

Degree (measure of an angle) The unit for measuring angles: 1 degree = 1 over 360° of a complete turn.

Denominator The number of equal parts in the whole or group: 3 over 4 - The denominator is 4.

Diagonal A line segment joining 2 nonadjacent vertices in a polygon.

Diameter A chord that passes through the centre of a circle.

Discount An amount deducted from the price of an article.

Divisible A number is a divisible by another number when the remainder is zero.

Dodecagon A polygon with 12 sides.

Dodecahedron A polyhedron with 12 faces.

Edge The straight line that is formed where 2 faces of a polyhedron meet.

Equation A number sentence that contains the symbol=.

Equilateral Triangle A triangle with all sides equal.

Equivalent Fractions Fractions that represent the same part of a whole or group:1/3, 2/6, 3/9, 4/12.

Equivalent Ratios Ratios that represent the same fractional number or amount: 1:3, 2:6, 3:9.

Expanded Form The way in which numbers are written to show the total value of each digit: 235=2x100+3x10+5x1.

Exponent Raised number used in a power to indicate the number of repeated multiplication of the base:4²- exponent=2.

Expression A mathematical phrase made up of numbers and variables, connected by operators.

Face A plane surface of a polygon.

Factors The numbers that are multiplied to produce a specific product.

Factor Tree A diagram used to factor a number into its prime factor.

Flow Chart An organized diagram that displays the steps in a problem's solution.

Fraction A number that describes part of a whole or part of a group.

Frequency The number of times an item or event occurs.

Frequency Table A table that uses tallies to count data.

Graph A representation of information in pictorial form.

Greatest Common Factor (GCF) The largest factor that 2 or more numbers have in common: 8, 12, & 24 - GCF is 4.

Grid A pattern of dots or lines.

Height The perpendicular distance from a vertex of a polygon to the opposite side.

Heptagon A polygon with 7 sides.

Hexagon A polygon with 6 sides.

Hexahedron A polyhedron with 6 faces.

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

Image The figure produced by a transformation.

Improper Fraction A fraction whose numerator is greater than its denominator: 12/5.

Inequality A statement that one expression is greater than, less than, or not equal to another expression.

Integers Numbers in the sequence... -3, -2, -1, 0, 1, 2, 3,.....

Intersecting Lines Two lines that cross each other at one point.

Inverse Operations Operations that counteract each other, such as addition and subtraction.

Isosceles Triangle A triangle with 2 equal sides.

Line A set of points that contains no endpoints.

Line of symmetry A line that divides a figure into congruent parts.

Line Segment A part of a line. A line segment has 2 endpoints.

Lowest Common Denominator (LCD) The lowest multiple shared by 2 or more denominators. 1/8, 1/6 LCD is 24.

Lowest Common Multiple (LCM) The lowest multiple shared by 2 or more numbers: 5, 10, 15 - LCM is 30.

Lowest Terms A fraction whose numerator and denominator have no common factors other than 1.

Magnitude Size.

Mass The amount of matter in an object, usually measured in grams and kilograms.

Mean The sum of the numbers divided by the number of numbers in a set.

Median The middle number in a set of numbers arranged in order. If there is an even number of numbers the median is the average of the 2 middle numbers.

Mid point The point dividing a line segment into 2 equal parts.

Mixed Number A number that is the sum of a whole number and a fraction: 9 5/8.

Mode The number that occurs most frequently in a set of data: 1, 2, 2, 6, 6, 6 - Mode is 6.

Multiples Repeated additions within a group: 5, 10, 15, 20 are the multiples of 5.

Math Glossary Continued-->