According to Pythagorean Theorem, the length of the first question is xm.

x^= 12^+5^

x^= 169

The solution is x= 13. So the long tail is 13 meters.

There is nothing wrong with the second question, which is 58cm long and 46cm wide. Imagine the TV as a rectangle and set the diagonal length to xcm. According to Pythagorean theorem. x^=58^+46^

x^=5480

X is about 74.

I hope I can help you.