1st pic
answer
D. Yes. triangle JKL similar to triangle STV. SF is 6
----------
2nd pic
answer is A.
No because length of corresponding sides are not proportional
--------------
3rd pic
34/17 = 12
so
x = 30/2 = 15
y = 16/2 = 8
answer
x = 15
y = 8
--------------
4th pic
28/14 = 2
so
x = 42/2 = 21
y = 56/2 = 28
z = 42/2 = 21
answer
x = 21
y = 28
z = 21
