None. The only shape with a diameter is the circle.
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When a circle is folded along its diameter, it creates two congruent halves or semicircles.
It depends what shape you are trying to find. If it is a circle, use the following:C = DpiCircumference = Diameter x PiTake the diameter of the circle, or twice the radius, and multiply it by pi, which is ~3.14If it is any other shape, just add up the sides if they are given.
A circle is different from another shape because of the following reasons:- It is a perfectly rounded shape It has a circumference It has a diameter It has a radius It has chords It has sectors It has segments It has infinite lines of symmetry Its circumference divided by its diameter is the value of pi Its area is: pi times radius squared Its circumference is: 2*pi*radius or diameter*pi
It depends what you know. The top of a cylinder is in the shape of a circle. So, to find the diameter of the cylinder (which is also the diameter of the circle), if you know the radius, just multiply it by two.
The perimeter is equal to Pi times the diameter.