# GMAT QUANT

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360

180

(1/2)(b)(h)

### An isosceles triangle has...

two equal sides and two equal angles

(b)(h)

(π)(r²)

(2)(π)(r)

(l)(w)(h)

(π)(r²)(h)

x-x√3-2x

x-x-x√2

a²+b²=c²

30-60-90

45-45-90

### (f) Sum of interior angles of a polygon

180(n-2) n=number of sides

### Definition of RATE

distance/time OR amount of work/time

the average

### Definition of MODE

the number that occurs most frequently

### Definition of MEDIAN

the middle number

### Definition of CONVEX POLYGON

A polygon with interior angles that measure less than 180 degrees.

### (f) Perimeter of a polygon

sum of the lengths of its sides

hypotenuse

trapezoid

### (f) Area of a trapezoid

1/2 (sum of bases)(height)

### What is a chord of a circle?

a line segment that has its endpoints on the circle

### (f) Length of an arc of a circle

x / 360 x=angle between two circle radius

tangent

### (d) What is an inscribed polygon?

Each vertex of the polygon lies on a circle

### (d) What is a circumscribed circle?

A circle containing a polygon where each vertex of the polygon touches the circle

### (d) What is a circumscribed polygon?

A polygon that has each side tangent to a circle. The circle is in the polygon.

### (d) What is an inscribed circle?

A circle that is contained by a polygon. Each side of the polygon is tangent to the circle.

A right triangle

### (f) How do you determine the distance between 2 points in a coordinate plane?

Draw a triangle and use the Pythagorean theorem

### (f) Formula for slope of a line

m=(y₁- y₂)/(x₁- x₂)

### (d) What is the y-intercept?

The point where a line intersects the y-axis.

### (d) What is the x-intercept?

The point where a line intersects the x-axis.

### What direction does a negative line slope slant?

Downward from left to right

### (f) Quadratic polynomial function and purpose

f(x) = x² - 1 Typically used to find coordinates (x, f(x))

### (d) What is a proportion?

A statement that two ratios are equal. Ex. 2/3 is proportional to 8/12

### (d) What is the range for a series of numbers?

The greatest value in the set minus the least value.

### How do you determine the standard deviation for a set of numbers?

1 - Find the mean
2 - Find the differences between the mean and each of the n numbers
3 - Square each of the differences
4 - Find the average of the squared differences
5 - Take the nonnegative square root of the average

1

1

2

6

24

120

720

5040

### (d) Factorial n!

The product of all positive integers less than or equal to n i.e. (n)(n-1)(n-2)...(1)

### Rule for dividing exponents (x⁸ / x⁵=...)

Subtract exponents (x³)

### Rule for raising to a power [ (x³)² =]

Multiply exponents (x⁶)

1

### A fraction between 0 and 1 raised to a positive integer is...

smaller than the original fraction

(ab)(√(rs))

### The square root of a fraction between 0 and 1 is...

greater than the original fraction

It is neither

+

+

-

-

### How to find all common factors of two numbers

Break down both numbers to their prime factors to see what factors they have in common. Multiply shared prime factors to find all common factors

### Simple Probability

(# of favorable outcomes)/(# of possible outcomes)

### Gross Profit

Selling Price - Cost

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