*If you mean that the distance between diagonally opposite corners on the square is 14 inches then it is a question of applying Pythagoras' Theorem. Think of the square as being 2 right angled triangles placed together, each having a hypotenuse of 14 inches.*

*Using Pythagoras (Square of Hypotenuse equal to sum of squares of 2 other sides), firstly, you square the hypotenuse = 14 x 14 = 196.*

*Thus, the squares of the 2 other sides add up to 196.*

*As we started with a square shape, we know that each of the other sides are the same length, so each side squared must be 196 / 2 = 98.*

*Thus the square of each side of the square(shape) is 98.*

*So, the length of each side is the square root of 98 which is approx 9.9 inches.*