joey has a square piece of paper with edges that are 8 inches long. he cuts the paper along a diagonal to make two congruent triangles. which measurement is closest to the length, in inches of the hypotenuse of each triangle

If we have a square measuring 8 inches along every side, when we cut from corner to corner, we have 2 congruent triangles with base measures of 8 inches and height measures of 8 inches. We need to find the measure of the hypotenuse which we can find using Pythagorean's Theorem:
and
and
s0
c = 11.3

Answer might be d.i think