Respuesta :

Answer: 4.6 km

Step-by-step explanation:

a^1 + b^2 = c^2

2^2 + b^2 = 5^2

4 + b^2 = 25

b = sqrt 25 - 4

b = sqrt 21 = 4.6 km

2^2 + b^2 = 5^2
4 + b^2 = 25
b^2 = 25 - 4
b^2 = 21
b = square root (21)
b = 4.6
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