Respuesta :

suspho

Answer:

Step-by-step explanation:

16

using proportion

12 : 3 = x : 4

x = 12 * 4 : 3

x = 48 : 3

x = 16

using Pythagorean theorem

√(20²-12²) =

√(400 - 144) =

√256 =

16

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