Is there an easy way to determine the dimensions of the sides of an octagon for our canvas? To make an octagon you want to cut off the corners, but how much to cut? The answer is .2929 times the side of the square. So, in this case, if the material is 20 feet, that’s 240 inches. Multiply that by .2929 and you get 70.296 or slightly more than 70 and 1/4 inches. Measure that amount in both directions from the corner, draw a line to the marks and cut it off. Should be very close. This assumes, of course, that your material is square. If not, first measure to make the square and then follow this advice. Then, before cutting, measure to see that […] Read More