Respuesta :

ChrisTEMS
Hello we know that the triangles are proportional so they have the same ratio
the unknown side is 21 because of this.
18/6=3/1
for each 1 unit in the bottom triangle there are 3 in the top
9×3=21
MissionExam001
The ▲TSU ~ ▲KLJ
|KS| and |KL| are similar.
|TU| and |KJ| are similar.

1st/2nd = 1st/2nd
18/6= x/9
3/1= x/9

9 is nine times more 1
so the x must be nine times more as well.
3.9=27

Hope it helps!
#MissionExam001