Respuesta :

amna04352

Answer:

B

Step-by-step explanation:

SUR and TUS will be similar figures

SU/TU = RU/SU

h/12 = (42-12)/h

h/12 = 30/h

h² = 30×12

h²= 360

h = sqrt(360) = sqrt(36×10)

h = sqrt(6²)×sqrt(10) = 6sqrt(10)