Answer:
[tex]height = 12 \: \: mm[/tex]
Step-by-step explanation:
[tex]area = \frac{1}{2} \times height \times base \\ 108 = \frac{1}{2} \times h \times 18 \\ 108 = \frac{18h}{2} \\ 108 = 9h \\ \frac{108}{9} = \frac{9h}{9} \\ h = 12[/tex]
hope this helps
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