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Respuesta :

15.6
18^2-9^2 will give you 243 and the square root of 243 is approximately 15.6
Using a^2+b^2=c^2
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Step-by-step explanation:

let the missing side be "X"

Therefore :9² +x²=18²

81+x²=324

x²=324-81

x²=243

√x²=√243

x=15.6

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