The area of a triangle is \(A_{triangle}=\frac{1}{2}bh\)
Where \(b\) is the base and \(h\) is the height.
So we plug in the numbers:
\(A_{triangle}=\frac{1}{2}*\frac{1}{4}*\frac{1}{3} = 0.04in^{2}\)
Remember: the measurements are in inches (4x3) and not feet. So the real measurements are \(\frac{4}{12} = \frac{1}{3}\) and \(\frac{3}{12} = \frac{1}{4}\)!
