Formulas

Question 1

Distance

Answer 1

rate x time=rt=d

Question 2

Slope of a line with Endpoints

Answer 2

Question 3

Distance Formula

Answer 3

=D

Question 4

Midpoint Formula

Answer 4

Question 5

Circles

Lenght of an arc

Answer 5

(x/360)[2(3.14 or pi)r]

x=central angle of the arc

Question 6

Circle

Area of sector

Answer 6

(x/360) [(pi)r*r]

x=central angle of the sector

Question 7

Combination

Number of combinations

Answer 7

N!\R!(N-R)!

N= number of total items

R= number of items being choosen

Question 8

Permutations

number of permuttation

Answer 8

N!(N-R)!

N= Number of items

R= Number of items being choosen

Question 9

Lenght of a Diagonal of a Cube

Answer 9

s(2to the square root)

Question 10

Length of a Diagonal of a Cube

Answer 10

s(3 square root)

Question 11

Length of a Diagonal of a Rectangular Solid

Answer 11

Square [(x*x)+(y*y)+(z*z)]=D

Question 12

Number of Diagonals for a Convex Polygon with
N Sides

Answer 12

N(N-3)\2

Question 13

Sum of the Measures of the Interior Angles of a Regular Polygon with
N Sides

Answer 13

(N-2)180

Question 14

Heron’s Formula

Answer 14

Question 15

Pythagorean Theorem: (Can be used with
all right triangles)

Answer 15

(a*a)+(b*b)=(c*c)

Question 16

Geometric Mean

Answer 16

a\x=x\b then (x*x)=ab and x=ab squared root

Question 17

Regular Polygon

Answer 17

measure of a central angle=360\n; n= number of side of the polgyon measure of a vertex angle=180-360\n;n= number of side of the polgyon

Question 18

Ratio of Two Similar Figures

Answer 18

If the ratio of the measures of corresponding side lengths is
A:B,then the ratio of the perimeters isA:B, the ratio of the areas is
A² :B² and the ratio of the volumes is A³ :B³

Question 19

Difference of Two Squares

Answer 19

a²-b²=(a-b)(a+b)

Question 20

Greatest Common Factor (GCF)

Answer 20

Multiply the two numbers and divide by the Least Common Multiple (LCM)
Example: to find the GCF of 15 and 20, multiply 15×20 = 300,then divide by the LCM, 60. The GCF is 5

Question 21

consececutive

Answer 21

n(n+1)/2