Math Formulas

Question 1

Perimeter of a rectangle

Answer 1

2L + 2W

Question 2

Perimeter of a triangle

Answer 2

A + B + C

Question 3

Pythagorean Theorem for right triangles

Answer 3

a squared plus b squared = c squared

Question 4

Area of a triangle

Answer 4

Area = 1/2 base x height

Question 5

Volume of a rectangular box

Answer 5

length × width × height

Question 6

Volume of a cube

Answer 6

length of sides to the power of 3

Question 7

Surface area of a cube

Answer 7

6(edge) to the power of 2

Question 8

In a 30°-60°-90° right triangle, the corresponding opposite side ratio is

Answer 8

1:√3:2

Question 9

Volume of a cylinder

Answer 9

πr^2h

Question 10

How do you calculate percent increase?

Answer 10

Calculate the difference between the numbers, then set the difference over the first (lower) number. Multiply by 100.

Question 11

Area of a square

Answer 11

Value of one side to the power of 2

Question 12

Area of a circle

Answer 12

A = ℼr^2

Question 13

Circumfrence of a circle

Answer 13

C = 2ℼr

Question 14

Diameter of a circle

Answer 14

2r

Question 15

Combinations formula

Answer 15

nCk = n!/ k!(n−k)!
(n = amt choosing from)

Question 16

Area of a circle with circumference

Answer 16

A = C^2 / 4ℼ

Question 17

Percent change formula (increase/ decrease)

Answer 17

%change = (change/ original amt) (100%)

Question 18

Ratio of isosceles right triangle sides (45°-45°-90°)

Answer 18

1:1 (legs):✓2 (hypotenuse)