Y. this one is similar to the above triangle.
proof :-
if we subtract the sum of two angles in triangle Y from 180° we get 88°. which is the third angle of the above triangle.
and sum of 88° + 20° = 108°
by angle sum property, we can find it's another angle..
= 180° - 108°
= 72°
hence, it's proved that both triangles are same.
