What is the range for the third size of the triangle 13,24?

Find the gradient of f(x, y,z)equals=left parenthesis x squared plus y squared plus z squared right parenthesis superscript negative 1 divided by 2 baseline plus ln left parenthesis x right parenthesis x2+y2+z2−1/2+ln(xyz) at the point left parenthesis negative 2 comma 1 comma negative 2 right parenthesis(−2,1,−2).

Guys i really need or i have to stay late up night

Which graph has figures that can undergo a similarity transformation to justify that they are similar? (obviously not the third one)