STEP 1: find side $ a $

To find side $ a $ use formula:

$$ d = 2 \cdot a $$

After substituting $d = \dfrac{ 12 }{ 5 }\, \text{cm}$ we have:

$$ \frac{ 12 }{ 5 }\, \text{cm} = 2 \cdot a $$ $$ a = \dfrac{ \frac{ 12 }{ 5 }\, \text{cm} }{ 2 } $$ $$ a = \frac{ 6 }{ 5 }\, \text{cm} $$

STEP 2: find area $ A $

To find area $ A $ use formula:

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

After substituting $a = \dfrac{ 6 }{ 5 }\, \text{cm}$ we have:

$$ A = \dfrac{ 3 \sqrt{ 3 } \cdot \left( \frac{ 6 }{ 5 }\, \text{cm} \right)^{2} }{ 2 } $$ $$ A = \dfrac{ 3 \sqrt{ 3 } \cdot \frac{ 36 }{ 25 }\, \text{cm}^2 }{ 2 }$$ $$ A = \dfrac{ \frac{ 108 \sqrt{ 3}}{ 25 }\, \text{cm}^2 }{ 2 }$$ $$ A = \frac{ 54 \sqrt{ 3}}{ 25 }\, \text{cm}^2 $$

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