Answer:
The length side of the square is
![7√(2)\ cm](https://img.qammunity.org/2020/formulas/mathematics/middle-school/x8ne1bltolzzc0cj3bqz2fob7m7f8wewpq.png)
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
![d^2=b^2+b^2](https://img.qammunity.org/2020/formulas/mathematics/middle-school/ewkbejd8ob0zldkx0d6nq4y0yzu1iz9m49.png)
![d^2=2b^2](https://img.qammunity.org/2020/formulas/mathematics/middle-school/40k7r59ly9l0kx4g5gmb3kiygx6y6pi4gz.png)
we have
![d=14\ cm](https://img.qammunity.org/2020/formulas/mathematics/middle-school/i248d7qh0irjrpoeiiih2a1nmzp4d9s8kc.png)
substitute the given value
![14^2=2b^2](https://img.qammunity.org/2020/formulas/mathematics/middle-school/o102tpone8tmx103foahgmfmq3iinpq42u.png)
solve for b
![196=2b^2](https://img.qammunity.org/2020/formulas/mathematics/middle-school/oqc0blhisveqk65jhmkobnt5qt17t6rove.png)
![98=b^2](https://img.qammunity.org/2020/formulas/mathematics/middle-school/a3tnmd061zus36de37f93xv798c8l7lqie.png)
take square root both sides
![b=√(98)\ cm](https://img.qammunity.org/2020/formulas/mathematics/middle-school/4bzrs0350ssa01ix1vbdqm2foqgp5zt2fj.png)
simplify
![b=7√(2)\ cm](https://img.qammunity.org/2020/formulas/mathematics/middle-school/hyz28htu3exae7odzk8dlew4dd02w88jnd.png)