The broken part is 10-x feet.
Obviously, the broken part is the hypotenuse.
So (10-x) 2 = x2+3 2.
x^2-20x+ 100=x^2+9
20x=9 1
x=4.55
So it's 4.55 feet
a^2-b^2=(a+b)(a-b)=(m+n? +m? -n? )(m+n? -m? +n? )
=4m? n? =c?
So a? =b? =c?
So it is a right triangle.
Because of 60? +80? = 100?
So his route is a right triangle.
So the first turn is a right angle.
So it's south or north.