Math Formulas

Question 0

Word Problems: Discount =

Answer 0

Cost x Rate of Discount

Question 1

Word Problems: Interest =

Answer 1

Principal x Rate x Time

Question 2

Word Problems: Distance =

Answer 2

Rate x Time

Question 3

Geometry–Rectangles & their variants: Perimeter of a Square =

Answer 3

4 x Side

Question 4

Geometry–Rectangles & their variants: Perimeter of a Rectangle =

Answer 4

(2 x Length) + (2 x Width)

Question 5

Geometry–Rectangles & their variants: Area of a Rectangle =

Answer 5

L x W

Question 6

Geometry–Rectangles & their variants: Area of a Square =

Answer 6

S^2

Question 7

Geometry–Rectangles & their variants: Area of a Parallelogram =

Answer 7

Base x Height

Question 8

Geometry–Rectangles & their variants: Area of a Trapezoid =

Answer 8

1/2 (B1 + B2) x Height

Question 9

Geometry–Circles: Diameter of a Circle =

Answer 9

2 x Radius

Question 10

Geometry–Circles: Circumference of a Circle =

Answer 10

π x Diameter
OR
2π x Radius

Question 11

Geometry–Circles: Area of a Circle =

Answer 11

πr^2

Question 12

Geometry–Triangles: Area of a Triangle =

Answer 12

1/2 Base x Height

Question 13

Geometry–Triangles: Pythagorean Theorem =

Answer 13

a^2 + b^2 = c^2

The square of the length of the hypotenuse is equal to the sum of the squares of the legs.

Question 14

Geometry–Triangles: Distance Formula =

Answer 14

d= the square root of [(X1—X2)^2 + (Y1 —Y2)^2]

Distance between two points P1 (X1, Y1) and P2 (X2, Y2)

Question 15

x^-a =

Answer 15

1/x^a

Question 16

(x^a)(x^b)

Answer 16

x^(a-b)= 1/[x^(b-a)]

Question 17

x^0=

Answer 17

1

Question 18

(x^a)(y^a)=

Answer 18

(xy)^a

Question 19

a^2-b^2=

Answer 19

(a+b)(a-b)

Question 20

(x/y)^a=

Answer 20

x^a/y^a

Question 21

(x^a)^b=

Answer 21

x^ab

Question 22

Simple interest

Answer 22

V=P(1+(rt/100))

Question 23

Compound interest: annual interest rate of r percent compounded annually

Answer 23

V= P(1+(r/100))^t