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[tex]area = \frac{1}{2} \times (height) \times (base) \\ [/tex]
[tex]height = 11 \: \: cm[/tex]
[tex]base = 18 \: \: cm[/tex]
Thus :
[tex]area = \frac{1}{2} \times 11 \times 18 \\ [/tex]
[tex]area = \frac{18}{2} \times 11 \\ [/tex]
[tex]area = \frac{2 \times 9}{2} \times 11 \\ [/tex]
[tex]area = 9 \times 11[/tex]
[tex]area = 99 \: \: {cm}^{2} [/tex]
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