The answer is 374 cm²
Area (A) of a hexagon with side a is:
[tex]A= \frac{3 \sqrt{3} }{2} a^{2} \\ \\
a = 12cm \\ \\
A= \frac{3 \sqrt{3} }{2} 12^{2} \\ \\
A= \frac{3 \sqrt{3} }{2} *144 \\ \\
A =\frac{3 *1.73}{2} *144 \\ \\
A = 373.7 cm^{2} [/tex]
A ≈ 374 cm²