AREA OF A RECTANGLE
A = L x W
A = area of a rectangle
L = length of a rectangle
W = width of a rectangle
AREA OF A CROSS SECTION
The cross section of an object is a plane figure established by a plane cutting
the object at right angles to its axis. The area of this cross section will be the area
of the plane figure produced by this cut.
The area of the cross section is L ö W.
The most common units are square inches, square feet, square yards and
in roofing, squares.
1 square foot
= 144 square inches
1 square yard
= 9 square feet
1 square of roofing = 100 square feet
Convert 17,250 square foot to squares of roofing.
CONVERSION OF UNITS OF CUBIC MEASURE
It is often necessary to convert from one cubic measure to another. The
conversion factors used are as follows:
1 cubic foot = 1,728 cubic inches
1 cubic yard= 27 cubic feet
1 cubic foot = 7.48 U.S. gallons (liquid measure)
1 U.S. gallon (liquid measure) = 231 cubic inches
1 bushel (dry measure)= 2,150.42 cubic inches
1. How many cubic feet are therein 4,320 cubic inches?