Question 234523
Use A = LW

120 = L(10)

120/10 = L

12 = L

The length is 12 meters.

I will set up the Pythagorean Theorem that you need to find your diagonal.

Keep in mind that the diagonal is the hypotenuse.

Let d = diagonal

(12)^2 + (10)^2 = (d)^2

Can you finish now?