Geometry
Formulas
9th Grade Vocab
The Number System
Operations
100

To spin a shape on a graph

Rotation

100

The number in front of a variable

Coefficient

100

First. Outer. Inner. Last. 

FOIL

100

A whole number that is either positive or negative

Integer 

100

To sum means to 

Add

200

To move a figure on a coordinate plane up, down, left, or right

Translation 

200

This letter represents slope

m

200

The longest side of a triangle

Hypotenuse 
200

The fraction 1/2 is a ______ decimal 

Terminating 

200

Touching in math means

Multiplying

300

Two angles on the same transversal that are in the same 'position'

Corresponding angles

300

This letter represents the y - intercept

b

300

To break a trinomial down; the opposite of FOILing 

Factoring

300

Any number that can be written as a fraction is

Rational

300

What is the first step in solving: 3(x-2) = 2(x+2)

Distributing 

400

You use this to find a missing side on a right triangle

a2 + b2 = c2

400

The formula for slope is 

y2 - y1

____

x2 - x1

400

Lines that have the exact same slope are 

Parallel

400

The number pi is an example of an ______ number 

Irrational 
400

A fraction is really just think kind of math problem

Division
500

Slope is also known as a _____ _____ 

Unit Rate

500

The formula for the volume of a cylinder is

3.14 x r2 x h

500

A polynomial with 3 terms

Trinomial 

500
All of the numbers we've used this year are these kinds of numbers

Real

500

The opposite of squaring a number 

Square root