The formula for the area (A) of a circle is \(A = \pi r^2\), where \(r\) is the radius of the circle. Given that the diameter of the steel bar is 10 mm, the radius \(r\) is half of that, which is 5 mm or 0.005 m (since 1 mm = 0.001 m).
So, \(A = \pi (0.005)^2 =
Show more…