28 ,81, 100, 121,
7, 9, 10, 11,

The length is 10 and the area is 100 because 6,8,10 is a pythagorean triple. 36 + 64 = 100 and the square root of 100 is 10. 10 ^ 2 is the area which is 100. If this is right could you possibly give me brainliest? Hope this helped.
By the pythagoras theorem
area of largest square = 36 + 64 = 100
length of hypotenuse = sqrt 100 = 10