There are two fairly straightforward ways to square up such a structure. Measure the length of the two diagonals. If they are equal, it is square. If not, adjust the position accordingly. If you are applying a plywood floor, you can generally use the edges of the first sheet of plywood for a square. Position it in a corner, align one edge with the joist an secure it with two or three nails or screws, then align the adjoining joist with the other edge of the plywood. I have used both these methods successfully.
As the later note mentions, any method of squaring assumes that opposing sides are equal length, or it will not be possible to have all four corners square. If they are not, you will be able to square only one corner at best, using the 3-4-5 method or the sheet of plywood. Measuring the diagonals offers the advantage of distributing any squaring error among the four corners, which is generally best.
As a tangential point, it is very tempting to rush the foundation work, but a poor foundation will work against you all the way to the roof. Getting the foundation and floor framing square and level can be tedious and time consuming, but it will then be your helper as you complete the project, and make it a more satisfying structure throughout its life.,
to mark the base square meusure 3 feet up one side 4 feet up the other side and 5 feet to ends of both to make a triangle and you've got your 90degree .
measuring diagonals is your best bet, but only if your 8'x10' measures right on the money!
If you want to see how to build the shed follow this link and you will see several videos and articles explaining how to do it yourself, just copy and paste this link into your browsed and you are off and running, good luck!
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