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Inches to M2

Inches to M2
by Robin Hughey on 10/07/03 at 14:12:48

I have a windshield that is 26" x 26" x 39" X 54".  I need to know what the conversion would be in meters squared.  How is this done?  ???

Re: Inches to M2
by Robert Fogt on 10/07/03 at 16:14:43

The dimensions you give sounds like you are describing a trapezoid.  Which looks like this:


The formula for the area is:
Area = h * (a+c)/2

But first you need to calculate the height, h:
h = (a+b-c+d)(-a+b+c+d)(a-b-c+d)(a+b-c-d)/[4(a-c)]

I didn't want to do this all by hand, so I just typed it into my TI calculator. Sorry in advance for not actually working it out step by step. :)

area = 1157.607 square inches

Now just go to the Area conversion page here:
And convert square inches to square meters.

Re: Inches to M2
by Robin Hughey on 10/08/03 at 07:18:58

Actually, the picture looks different.  I can't seem to figure out how to insert a picture to let you see what it looks like.  The top dimension is 26", the right dimension is 39", the bottom dimension is 54" and the left dimension is 26".  Does that help?  ???

Re: Inches to M2
by Robert Fogt on 10/08/03 at 23:48:26

Are two of the sides parallel?  I'm afriad it will be difficult to calculate if its not.

Take a look at this page here:

Notice the 3 different formulas for calculating the Area of a general quadrilateral.

Is the picture on the left side what it looks like?

Farther down the page is another picture of a trapezoid, which has two parallel sides like the picture I posted, just the left and right sides face a different direction.  Is that what it looks like?

Re: Inches to M2
by Robin Hughey on 10/09/03 at 12:18:17

The shape is the most like the second shape of the trapezoid.  On the picture it looks like one would have to use the corner measurements to calculate?  I only have the measurements that I wrote about earlier.  How would you figure it?  TKS!

Re: Inches to M2
by Robert Fogt on 10/09/03 at 17:19:18

Are two of the sides parallel?  If you could email me a picture of it this might be quicker.

Re: Inches to M2
by Robin Hughey on 10/10/03 at 10:34:46

I sent an email with a drawing of the windshield.  It isn't much, but should be sufficient.  Thanks!

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