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Answer:
Once nailed up, to check the structure is square simply measure from corner to corner. If the measurements aren't the same, pull the long corner towards the middle of the structure until they even out. Once identical,
And Used Protractor
The protractor has a blade that can be set at any angle relative to the axis of the ruler. The square has two main surfaces, one at right angles to the ruler axis and one at 45 degrees.