Respuesta :
9514 1404 393
Answer:
 30
Step-by-step explanation:
The altitude is the geometric mean of the two segments of the hypotenuse. For some scale factor x, the segments are 1x and 4x, and the altitude is ...
 12 = √((1x)(4x)) = 2x
 6 = x
So, the length of the hypotenuse is ...
 (1x) +(4x) = 5x = 5·6 = 30
The hypotenuse is 30 units long.