Respuesta :

shivaagrahari62

Answer:

15 m

Step-by-step explanation:

cross-section area=1/2×45×x m ²

height = 30 m

volume=10125m³

we have

volume = cross-section area×height

10125 = ½×45×x×30

x=10125×2/(45×30)

x=15m

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