measure one side of the square then multiply by 1.414 ex. a 10 in. square will have a corner to corner length of 14.14 in.
This length is half a diagonal. To find the diagonal of a square given a side use the Pythagorean theorem. Let s be a side and d the diagonal. Then d2 = s2 + s2 = 2s2 . so d = sqrt(2s2) = sqrt(2) s...
This length (diagonal) = sq.rt ( l2 + b2 ) where 'l' is length of the rectangle and 'b' is the breadth of the rectangle.
Make it right.
Adjacent corners of a square share one side. Opposite corners share no sides.
each of the 4 corners is 90 degrees because it has to equal 360 degrees total90+90+90+90=360