I guess you mean of a circle:
area_circle = π x radius2
circumference_circle = 2 x π x radius
π is the ratio of the diameter to circumference of any circle, is an irrational number and starts 3.14159265...
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Radius = square root of (area/pi) Circumference = 2*pi*radius
Divide its circumference by 2*pi which will give the radius of the circle. Area of the circle then is pi*radius squared
by timesing the circumference by pie
To find the area of a circle knowing only the circumference, you can use the formula A = (C^2) / (4π), where A is the area and C is the circumference. Square the circumference, then divide it by 4π to get the area.
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.