Respuesta :

pkmnmushy
We simply take the ratio between the corresponding sides and set them equal to each other ike this: 

h (left triangle's) /3 (right's)= 12 (left's) / h (right's)
Which will be: h/3=12/h
The rest I think you know how to proceed. I hope this helps you 

the answer on APEX is 6

Relax

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