### 18 Answers

- 10 years agoFavourite answer
1 diameter is equal to one meter because word dia is a constant, it comes from india so 1 diameter is equal to 1 meter

and one metre is equal to 100 cm and 1000 mm because 1 cm is equal to 10 mm

- Anonymous10 years ago
The confusion you are experiencing comes from the fact that this word has the word "meter" in it (and a severe lack of quality in the public education system but never mind that), but it is not an absolute amount.

1 diameter is the "width" of a circle. It is the longest straight line you can draw inside a circle before it touches 2 edges, and divides the circle into 2 equal halves.

A radius is the length between the centre of the circle, and the outside, the circumference. The diameter is = 2 * radius.

cm and mm are simply measurements of how much, you could have a 1cm diameter, a 1mm diameter, or a 500 gazillion bajillion (not real number) meter diameter.

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- 6 years ago
This Site Might Help You.

RE:

1 diameter = how many cm & mm?

Source(s): 1 diameter cm mm: https://biturl.im/k90B9 - 10 years ago
do u mean decimete,, plz corrct ur qstn.. diameter is the longst chord o a circle,, and the other definitions are already mentioned above so m nt repeating..

for mm ,cm n rest jst remembr d series

mili centi deci meter deca hecto kilo meter

i.e 10 mm=1cm, 10cm=1deci m, 10 deci m= 1m n so on

hope u cn gt mm n deci m frm dis too

- 10 years ago
The diameter is the distance across a circle. The units have to be defined by the math problem you're doing.