REmember that
If two triangles are similar, then the ratio of its corresponding sides is proportional and its corresponding angles are congruent
so
Verify
Triangle 2
Find out the interior angles
47, 64,x
the sum must be equal to 180 degrees
47+64+x=180
x=69 degrees
Triangle 3
interior angles
47,69 and the third angle must be 64 degrees
that means
triangle 2 and triangle 3 are similar
answer is
(2,3)