Answer
$A=1332~cm^{2}$
Work Step by Step
The area of the metal can be calculated by subtracting the areas of the two circles from the area of the rectangle:
$A=bh-\frac{\pi}{4}d_{1}^{2}-\frac{\pi}{4}d_{2}^{2}$
Where
$b=60cm$
$h=30cm$
$d_{1}=14cm$
$d_{2}=20cm$
So, we have:
$A=(60cm)(30cm)-\frac{\pi}{4}(14cm)^{2}-\frac{\pi}{4}(20cm)^{2}=1331.9cm^{2}\approx1332~cm^2$
