Answer :
Look at the picture.
Use the Pythagorean Teorem:
[tex]l^2+(5l)^2=d^2\\l^2+5^2l^2=d^2\\d^2=l^2+25l^2\\d^2=26l^2\\d=\sqrt{26}^2\\d=\sqrt{26}\cdot\sqrt{l^2}\\\boxed{d=l\sqrt{26}}[/tex]
Use the Pythagorean Teorem:
[tex]l^2+(5l)^2=d^2\\l^2+5^2l^2=d^2\\d^2=l^2+25l^2\\d^2=26l^2\\d=\sqrt{26}^2\\d=\sqrt{26}\cdot\sqrt{l^2}\\\boxed{d=l\sqrt{26}}[/tex]
![View image Аноним](https://us-static.z-dn.net/files/dc1/729c71e82124114fd67616c96a35e57d.png)