To
effectively work out a complex surface area, as shown
left.
Simply place an imaginary grid
of 1” squares
over the part, and count the whole squares. Then go
around the perimeter and add up all the squares that
are more than ½ full. Divide the total by 2
and add this to your total of completely filled squares.
Another method is to cover the
part with one layer of paper or tinfoil. Then remove
the tinfoil and cut into smaller pieces so it can be
arranged on the floor as close to a rectangle shape as
possible. Then simply multiply length x width of the
rectangle.
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