On 21 Jul 2005 18:36:04 -0700, firstname.lastname@example.org wrote:
The problem is you're multiplying width by length in your example.
Multiply length by width as in your subject line and you'll be okay.
(Forget 144. That's the running time in minutes of the vid you rented
Yes, square feet is the length (in feet) x the width (in feet). So, 10'x20'
is, in fact, 200 square feet.
The 144 you mention may have something to do with square "inches". 1 square
foot is 12 inches x 12 inches (144). So, you can multiply square footage by
144 to get the square inches. For your example, 200 square feet = 28800
square inches. I'm not sure why you would need to know that though... :)
To add a little more confusion, "CUBIC" feet is the length (in feet) x the
width (in feet) x the depth (in feet). For instance, if you were pouring a
sidewalk that was 10'x20'x6" thick (6 inches is half a foot, or .5 feet)
you would need 100 cubic feet of concrete.
Of course, concrete is usually ordered in "Cubic Yards" (3'x3'x3' or 27
cubic feet). So, for the 100 cubic feet of the last example, you would need
100/27 or 3.7 cubic yards of concrete.
Class dismissed... :)
ALL measurement formulas must work with the units involved...
Linear measurement (feet) multiplied by a linear measurement (feet) equals
a square measurement (feet*feet, or square feet).
144 is a conversion factor to convert from square feet to square inches as
there are 144 square inches in a square foot. The units of this conversion
factor is "sq. inches per sq. ft" or sq.in/sq.ft.
If you have 200 sq.ft and multiply by 144 sq.in/sq.ft, the number part
comes out to be 28800 and the units comes out as well:
sq.ft * sq.in / sq.ft = sq.in
If ever you cannot remember the calculation, just think about how the
units work out. For instance, if you cannot recall how to calculate
speed, think of its units: miles per hour (miles / hour) and you can
quickly realize that this is distance (miles) divided by time (hours).
"Never ascribe to malice what can equally be explained by incompetence."
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