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Squaring a Shed Floor... Diagonals of a Rectangle

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hey I'm building a shed in my backyard

I'm at the point right now where I'm

building the floor I have the outside

walls what kind of looks like a sandbox

but it's going to support the floor

joist across now before I go any further

I need to make sure that this is an

exact rectangle because if you have it

off of it and it's a parallelogram then

at least all kinds of problems as you

build the building now we've talked

about how to check if something is a

rectangle before those need to be right

angles they all need to be exactly 90

now one way of course you can check it

is using a Pythagorean theorem you could

measure that side you can measure that

side and then you know how long the

diagonal is doing some calculations but

since it's a rectangle there's actually

easier way to do we want it to be a


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