When given the base of and height of a triangle, you can use this formula:
[tex]area = \frac{1}{2} bh[/tex]
Plug in the known values:
[tex]area = \frac{1}{2} (18)(6)[/tex]
Solve:
[tex]area = \frac{1}{2} \times 108[/tex]
[tex]area = 54[/tex]
Add units:
[tex]area = 54cm^{2} [/tex]
