The circumference of a circle divided by its diameter is equal to the value of pi.
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Because pi is a constant. It is the ratio between the circumference and diameter of any circle (assuming it is a perfect circle).
The functional relation between the diameter d and the area a is a = (pi)(d/2)2. Therefore, (pi)d2 = 22(25) = 100; d = sq rt (100/pi) = 5.6 units, to the justified number of significant digits.
Circumference of a circle = 2*pi*radius or pi*diameter
If you mean the diameter of a circle with area pi, then the diameter is 2. If you mean the diameter of a circle with circumference pi, then the diameter is 2. If you mean the diameter of a circle with diameter pi, then the diameter is pi. If you mean the diameter of a circle with radius pi, then the diameter is 2pi.
(pi) times the diameter of the circle=pi*d