Weegy: Know the pythagorean theorem?
a^2 + b^2 = c^2
so draw a diagonal in your square
the SIDES of the square are "a" and "b"
the DIAGONAL of the square is the "c" because in your picture, [ it is the hypotenuse.
Since a = b in a square (all sides are equal), the final formula would be "square root of (2a^2)"
There is an easier way. A square with a diagonal makes a 45-45-90 triangle (refers to degree measures), a special right triangle. If ... (More)