Statement-I     The two lines having an infinite common points are called coin side line

Statement-II     If the angles in a triangle are in the ratio 1:1:2 , then the ratio of sides is 1:1:2

Statement (A) : If a line is just lying in the same line then they have infinite common points so are called coincide lines

Statement (B) :

Let $\overline{)A}:\overline{)B}:\overline{)C}=x:x:2x$

$x+x+2x=180°$

$4x=180°$

$x=45°$

$\therefore$  This is clearly right anlge isoscelers $\Delta$

By Pythegoras, $A{B}^2=A{C}^2+B{C}^2$

$A{B}^2=x^2+x^2$

$A{B}^2=2x^2$

$AB=\sqrt{2}x$

$\therefore BC:\text{}AC\text{}:\text{}AB=1:1:\sqrt{2}$