Only circles (or spheres) have a diameter
The diameter of a circle is twice the radius.
diameter = 12.56/pi
Circles have a diameter, not length. The diameter of a US cent is 19 mm.
It is: diameter = 31.4/pi which is about 10 units
diameter ------------- Diameter. The R (radius) of a circle multiplied by two equals the diameter.
Since with circles the radius is half the diameter, the diameter would be 6 cm.
It is the circle's radius
Every diameter of the same circle is the same length, and unless someone comes alongand stretches the circle when you're not looking, the diameter doesn't change.So...YES-----------I disagree...No they are not... all circles would be the same size if that were the case.What remains a constant is that all circles are 360 degrees.==================================The question doesn't ask about " ... the diameter of circles ... ".It asks about " ... the diameter of a circle ... ".The diameter of circles is not always the same, butthe diameter of any one circle is always the same.P.S.: This is not the place to debate the answer.The "discussion area" is.
A rectangle is an elongated square. It doesn't have a diameter; only circles have diameters.
The ratio of the circumference of a circle to its diameter is Pi. (3.14159)