STEP 1: find side $ a $

To find side $ a $ use formula:

$$ s = \sqrt{ 3 } \cdot a $$

After substituting $s = 8\, \text{cm}$ we have:

$$ 8\, \text{cm} = \sqrt{ 3 } \cdot a $$ $$ a = \dfrac{ 8\, \text{cm} }{ \sqrt{ 3 } } $$ $$ a = \frac{ 8 \sqrt{ 3}}{ 3 }\, \text{cm} $$

STEP 2: find area $ A $

To find area $ A $ use formula:

$$ A = \dfrac{ 3 \sqrt{ 3 } \cdot a^2 }{ 2 } $$

After substituting $a = \dfrac{ 8 \sqrt{ 3}}{ 3 }\, \text{cm}$ we have:

$$ A = \dfrac{ 3 \sqrt{ 3 } \cdot \left( \frac{ 8 \sqrt{ 3}}{ 3 }\, \text{cm} \right)^{2} }{ 2 } $$ $$ A = \dfrac{ 3 \sqrt{ 3 } \cdot \frac{ 64 }{ 3 }\, \text{cm}^2 }{ 2 }$$ $$ A = \dfrac{ 64 \sqrt{ 3 }\, \text{cm}^2 }{ 2 }$$ $$ A = 32 \sqrt{ 3 }\, \text{cm}^2 $$

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