
we know that
[tex]S=\frac{1}{2} \ units\\ \\A=12S^{2}[/tex]
so
substitute the value of S in the formula to calculate A
[tex]A=12*(\frac{1}{2})^{2}\\ \\A=12*(\frac{1}{4}) \\ \\A=3\ units^{2}[/tex]
therefore
the answer is
The value of A is [tex]3\ units^{2}[/tex]