If the rooftop is flat and shaped like a rectangle ...
-- measure the width of the roof, in meters
-- measure the length of the roof, in meters
-- multiply (width) x (length)
-- The product is the area of the roof in square meters.
If the rooftop is not shaped like a rectangle, or parts of it are sloped, then
you must mark it off in several sections, with each section being a rectangle.
Then measure and calculate the area of each section as described above, and
add them up.
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Square meters of what? If you want the area in square meters of a rectangle, just multiply the length times the width (both in meters). To get square meters of other figures, other formulae are required.
That is like asking how many yards in a gallon. There are no square meters in a meter, and no meters in a square meter.
Alright, darling, 1500 square feet is about 139.35 square meters. So, if you're thinking of redecorating your space, just remember you've got about 139 square meters to work with. Just make sure you measure twice and cut once, honey.
The area of a roof can be determined from the area covered by the building to the outside of the walls and taking in to account the pitch of the roof by adding on a percentage depending on the pitch. A method is shown at the web link below along with a table of the percentages to be allowed.
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