The Facts On File Algebra Handbook

Variables – Volume CHARTS & TABLES

Variables – Volume CHARTS & TABLES

Variables

Variables are used in algebra to express an unknown number or a quantity, and are

usually represented by letters. Some of the most common variables used in algebra

are n, x,and y.RENÉ DESCARTESinvented the idea of using the letters at the beginning

of the alphabet for known quantities, and the letters at the end of the alphabet for

unknown quantities. Here are some examples of terms with variables (in each case,

the variable is the letter):

x

5 y

a^2

6 b^3

9 n

Volume

Volume is the space occupied by a three-dimensional object.

Here is how to calculate volume (V):

Cylinder

Volume= 2 ×π×the radius (cubed)

V= 2 πr^3

Prism

Volume= area of the Base×height

V= Bh

Pyramid

Volume= area of the Base×height÷ 3

V= Bh÷3

Rectangular Solid

Volume= length×width×height

V= lwh

Sphere

Volume= diameter cubed ×^1 / 6 of π

V= d^3 ×.5236