To find area $ A $ use formula:
$$ A = \dfrac{ 3 \sqrt{ 3 } \cdot a^2 }{ 2 } $$After substituting $ a = 1700 $ we have:
$$ A = \dfrac{ 3 \sqrt{ 3 } \cdot 1700^2 }{ 2 } $$ $$ A = \dfrac{ 3 \sqrt{ 3 } \cdot 2890000 }{ 2 }$$ $$ A = \dfrac{ 8670000 \sqrt{ 3 } }{ 2 }$$ $$ A = 4335000 \sqrt{ 3 } $$