one side of the square inscribed in a circle of radius r is
sqrt2 * r
(the square root of two times the radius)
So the perimeter is 4 * sqrt2 * r
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If the circle inscribes the square, the diameter equals the square's side length. In this case, 16mm.
It is: 128/4 = 32 which is a side of the square and so 32*pi is the circumference of the circle
The circumference of a circle is the length of the circle's perimeter.
When the shape is a circle, then the perimeter is called"circumference".The circumference IS the perimeter of a circle.
to find the perimeter of a circle you simply do this (pi x D )