It is the same as finding the area of a circle which is: pi*radius2
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I think you are asking how do you calculate the VOLUME of a disk 250mm with a thickness of 20 mm. If that is so, then find the area of the circle using the Area = pi times radius squared formula and then multiply by the thickness to get cubic millimeters volume.
To find the perimeter you add and to find the area we multiply.
To find the relationship in width and area you can use the formula area/length = width. To find the area of a room you multiple the length by the width.
HOW TO FIND THE AREA OF A SQUAREmust x all sides
to find the surface area you have to first find the area of each part then add the areas together.