The first thing we must do in this case is to see that the triangles are similar.
Therefore, we have the following trigonometric relationship:
(4) / (y) = (y) / (12)
We clear the unknown:
y ^ 2 = 12 * 4
y = root (48)
y = root (3 * 16)
y = 4raiz (3)
Answer:
The value of y is:
y = 4raiz (3)