Math 9 Vocabulary And Terms

Front 1

Line of Symmetry

Back 1

A line that divides a figure into two reflected parts; sometimes called a line of reflection or axis of symmetry. A figure may have one or more lines of symmetry, or it may have none. It can be vertical, horizontal, or oblique (slanted).

Front 2

Center of Rotation

Back 2

A point about whcih the rotation of an object or design turns.

Front 3

Order of Rotation

Back 3

The number of times a shape or design fits into itself in one complete turn.

Front 4

Angle of Rotation

Back 4

The minimum measure of the angle needed to turn a shape or design onto itself. This may be measured in degrees or fractions of a turn. It is equal to 360 degrees, divided by the order of rotation.

Front 5

Real Numbers

Back 5

All of the following sets are parat of the whole set of Real Numbers (R)

Front 6

Whole Numbers

Back 6

Inclusively whole positive numbers. Whole numbers INCLUDE 0 (W)

Front 7

Natural Numbers

Back 7

Exclusively whole positive numbers. Natural numbers DO NOT INCLUDE 0 (N)

Front 8

Rational Numbers

Back 8

All numbers that can be written as a fraction; they also take the form of a repeating decimal and terminating decimals. These numbers may be EITHER positive or negative. (Q)

Front 9

Irrational Numbers

Back 9

All numbers with non repeating decimals (Q with bar on top)

Front 10

Square Roots

Back 10

The divisor (or equal factor) of a perfect square.

Front 11

Perfect Square

Back 11

The product of two equal rational numbers.

Front 12

Integers

Back 12

All whole numbers INCLUDING both POSITIVE, NEGATIVE numbers and ZERO. (I)

Front 13

Power

Back 13

A mathematical expression made up of a base and an exponent.

Front 14

Exponent

Back 14

The number of times you multiply the base by itself in a power.

Front 15

Base

Back 15

The number you multiply by itself in a power, located directly below the exponent or everything in brackets.

Front 16

Exponential Form

Back 16

A shorter way of writing repeated multiplication, using a base and an exponent.

Front 17

Coefficient

Back 17

A number that multiplies an expression in -3(2) exponent 4, the coefficient is -3.

Front 18

Exponent Laws

Back 18

Rules used to help simplify an expression with powers.

Front 19

Product of Powers

Back 19

When multiplying powers with the same base, keep the same base and add the exponents. Ex. a exponent n X a exponent m = a exponent n+exponent m.

Front 20

Quotient of Powers

Back 20

When dividing powers with the same base, keep the same base and subtract the exponents. Ex. (a) exponent n / (a) exponent m = (a) exponent n-exponent m

Front 21

Power of a Product

Back 21

When a product is raised to an exponent, you can rewrite each number in the product with the same exponent. Ex. (ab) exponent n = (a) exponent n X (b) exponent n.

Front 22

Power of a Quotient

Back 22

When a quotient is raised to an exponent, you can rewrite each number in the quotient with the same exponent. Ex. (a over b) exponent n = (a) exponent n over (b) exponent n

Front 23

Power of a Power

Back 23

When a power is raised to an exponent, multiply the exponents to find a single exponent and keep the same base. Ex. (a exponent n) exponent m = a exponent n X exponent m.

Front 24

Zero Exponent

Back 24

When any base except zero is raised to the exponent zero, the answer is 1. Ex. (a) exponent 0 = 1. (a) does not equal 0.

Front 25

Negative Exponent

Back 25

A negative exponent tells us to reciprocate the base and keep the exponent. Ex. (a) exonent -n = 1 over (a) exponent n.

Front 26

Enlargement

Back 26

An increase in the dimensions of a 2D or 3D object by a scale factor greater than 1

Front 27

Reduction

Back 27

A decrease in the dimensions of a 2D or 3D object by a scale factor less than 1.

Front 28

Scale Factor

Back 28

The constant factor by which all dimensions of an object are enlarged or reduced in a scale diagram.

Front 29

Scale

Back 29

A comparison between the size of an image and its original, expressed as a ratio, fraction, percent, in words, or in a diagram.

Front 30

Scale Diagram

Back 30

A drawing that is similar/proportional to the actual figure.

Front 31

Proportion

Back 31

Two equal ratios. Cross products are always equal in a proportion.

Front 32

Corresponding Angles

Back 32

Equal angles that have the same relative position in geometric figures.

Front 33

Corresponding Sides

Back 33

Lengths that have the same relative position in geometric figures. The ratio of corresponding lengths in similar figures will always be equal.

Front 34

Similar Figures

Back 34

Have the same shape (equal angles) but may be of different size (different lengths).

Front 35

Polygon

Back 35

A 2D closed figure made of three or more line segments.