Ineed with the pythagorean theorem

9.4 inches

Step-by-step explanation:

The distance between the opposite corners is the diagonal.

We can find this using the Pythagorean theorem.  The diagonal is the hypotenuse.

a^2 +b^2 = c^2

8^2 +5*2 = c^2

64+25 = c^2

89=c^2

Take the square root of each side

sqrt(89) = sqrt(c^2)

sqrt(89) = c

9.433981132=c

Rounding to the nearest tenth

9.4 inches = c

-11 / 35 is left

Step-by-step explanation:

Basically you just subtract the used length from the total length of the thread.

2/7 - 3/5

Make the denominators same before beginning!

Times 5 by both 2 and 7(top and bottom)

Times 7 by both 3 and 5(top and bottom)

(10-21)/35

= -11 / 35

Hope this helps!

Please mark brainliest if you think I helped! Would really appreciate!