Answer:
The length side of the square is

Explanation:
The question in English is
Find the measure of the side of a square whose diagonal is 14 cmd
Let
d ----> the diagonal of a square in cm
b ---> the length side of a square in cm
we know that
Applying the Pythagorean Theorem
see the attached figure to better understand the problem


we have

substitute the given value

solve for b


take square root both sides

simplify
