Is it possible to make 12 ft x12 ft square into a perfect octagon by cutting off the corners and how Please provide Dimensions and picture if possible?

You can turn a 12 x 12 foot (or inch) square into an octagon by measuring from the tip of each (90 degree) corner along the edge of each side 3 1/2 feet (or inches) to get the corners of your diagonal sides. You can also measure inward towards the center 2 1/2 feet (or inches, depending on the total desired size). Once you've drawn the sides, they should measure 5 feet (or inches) each.

1:Draw in the diagonals of the square. 2:Measure out from the centre of the square a distance of 6 ft along the diagonals towards each corner of the square and make marks. 3:You have 4 marks. Draw a line at right angles (90o) through each mark, to cut off the corners of the square. There's your octagon.