The last one- its the only one that applies to the 4* rule.
Notice the larger triangle is a right-triangle, and the small one is also a right-triangle. Also notice the "angle tickmark" on each. So both angles have a pair of angles that are equal on each.
the triangles are similar by AA.
I am sure but I am going with Property if equation . this is say if x =2 then 2 x y = 2y .
