Math: Formulas

Question 1

Area of a Regular Polygon

Answer 1

nx/2 (side length times apothem)/2

Question 2

(number of sides x length of one side x apothem)/2

Answer 2

Area of a Regular Polygon

Question 3

diameter

Answer 3

d = 2r (radius)

Question 4

2 x radius =

Answer 4

diameter

Question 5

circumference

Answer 5

2 x π x radius

Question 6

2 x π x r

Answer 6

circumference

Question 7

How to get radius if you know circumference

Answer 7

C/2π = r

Question 8

Area of a Parallelogram

Answer 8

base x height

Question 9

Area of a Triangle

Answer 9

(base x height)/2 or 1/2(base x height)

Question 10

(base x height)/2 or 1/2(base x height)

Answer 10

Area of a Triangle

Question 11

Area of a Square

Answer 11

side squared

Question 12

side times side

Answer 12

Area of a square

Question 13

Area of a Trapezoid

Answer 13

1/2 (Top base + bottom base) x height

Question 14

1/2 (Top base + bottom base) x height

Answer 14

Area of a Trapezoid

Question 15

Another way to say 1/2 (anything)

Answer 15

Divide (anything) by 2

Question 16

Area of a Rectangle

Answer 16

Length x width

Question 17

Length x width

Answer 17

Area of a Rectangle

Question 18

The area is always written by the measurement__________

Answer 18

squared

Question 19

Area of an Ellipse

Answer 19

π x radius of major axis x radius of minor axis

Question 20

π x radius of major axis x radius of minor axis

Answer 20

Area of an Ellipse

Question 21

π

Answer 21

3.14 or 22/7

Question 22

3.14 or 22/7

Answer 22

π

Question 23

Volume of a cube or rectangular box

Answer 23

length x width x height

Question 24

length x width x height

Answer 24

Volume of a cube or rectangular box

Question 25

Volume of a sphere

Answer 25

V = 4/3π(radius cubed)

Question 26

V = 4/3π(radius cubed)

Answer 26

Volume of a sphere

Question 27

Volume of a cone

Answer 27

V = [π(radius squared)h)]/3

Question 28

V = [π(radius squared)h)]/3

Answer 28

Volume of a cone

Question 29

Volume of a Pyramid

Answer 29

Volume = (Area of the Base x Height)/3

Question 30

Volume = 1/3 x Area of the Base x Height

Answer 30

Volume of a Pyramid

Question 31

Volume of a Rectangular Prism

Answer 31

(V) = l × w × h

Question 32

(V) = l × w × h

Answer 32

Volume of a Rectangular Prism

Question 33

Volume of a Cylinder

Answer 33

π × cylinder radius² × cylinder height

Question 34

π × cylinder radius² × cylinder height

Answer 34

Volume of a Cylinder

Question 35

The volume of an object is always expressed as the measurement
______________

Answer 35

Cubed

Question 36

How do you get the Surface Area of a Pyramid?

Answer 36

1. Compute the area of the base
2. Compute the perimeter of the base
3. Identify the Slat Height (no the pyramid height.)
4. Use this formula:
   SA = Base Area + Half of (Perimeter of the base x Slant Length)