Please help me with this.

The height of the oblique cylinder is 7.5 m.
The volume of a cylinder is calculated from the formula below:
[tex]V_{cylinder}= Area \;of\;base * h=\pi r^2h[/tex] , where:
Area of base = area of circle = [tex]\pi[/tex]r²
h= height
The question gives:
Volume= 90[tex]\pi[/tex] m³
Area of base = 12[tex]\pi[/tex]m²
Then,
[tex]V_{cylinder}= \pi r^2 h\\ \\ 90\pi =12\pi h\\ \\ h=\frac{90\pi }{12\pi } \\ \\ h=7.5 m[/tex]
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