An acute triangle has sides of length of 6,7, and x, Solve for X

Question

I got two answers: the square root of 13 is less than x and x is less than square root of 85 for the first

The second one is that 1 is less than x and x is less than 13. Which one is correct?

Answer 1

1<x<sqr85

an acute angle is less than a right angle, so 90 degrees > the maximum acute angle possible

with a right angle the hypotenuse = square root of the sum of squares of the sides = sqr(6^2 + 7^2) = sqr(36+49) = sqr85

the smallest acute angle > 0

with angle = 0 the other side = 1. the two sides 6 and 7 collapse into the same line