for calculating area and volume for that particular

Area is the extent of a surface bounded by two

figure.

dimensions, such as length and width. The unit of

measure showing area is the square, such as square

When values are enclosed in parentheses ( ),

inches, square feet, and square yards.

brackets [ ], or braces { }, they are grouped. Some

equations contain a group within a group. An example

Volume is the extent of an object bounded by three

of this is the formula for finding the area of a trapezium

dimensions, such as length, width, and height. The unit

where

of measure showing volume is the cube, such as cubic

inches or cubic feet.

A = 1/2[a(e + d) + bd + ce].

To find the area (A) of the rectangle shown in figure

In this formula you have parentheses and brackets.

14-35, you must multiply the length (L) by the width

Parentheses can be enclosed in braces, and braces can

(W) or A = LW. Since L = 8 inches and W = 5 inches,

A = 8 x 5 = 40 square inches.

To find the volume (V) of the cube shown in figure

14-36, you must multiply length (L) times width (W)

times height (H), or V = LWH. Since L = 8 inches,

W = 5 inches, and H = 7 inches, V = 8 5 7=280

cubic inches.

Many of the geometric figures you will be

concerned with are shown in figure 14-37. With each

figure is the formula and some examples of problems

14-19