for circumference you multiply diameter by pi (22 over 7 or 3.14) and for area you do radius (half of diameter) multiplied by itself then multiplied by pi. if you want volume you can multiply the height of the cylinder by the area of it's circle.
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there is no constant that will calculate this, since circumference is calculated with only radius and area with radius squared. you will have to calculate the radius using the initial circumference and then the radius again for the new circumference (with the 50 added). then calculate an area for each radius..then you can see the increase.
The answer will depend on what is meant by "how do you you do" or even "how do you do". I do not do circumference. A can draw it, I can calculate it, I can calculate other measures (area, radius, diameter) from it but I do not DO it!
pi*radius2 = area radius = square root of (area/pi) circumference = 2*pi*radius
Using the Circumference And Area.
start real length L and width w calculate the area A= Lw calculate the circumference C=2(L+w) Display A and C End