Twice the radius.
The circumference is equal to pi ( 3.14167... ) times the diameter. You do the math.
Since the circumference of a circle is equal to its diameter times pi, the o.d. of a pipe is equal to its exterior circumference divided by pi.
for math
It is equal to a diameter of 10.5 units of length.
DIASMETER
No
A line that bisects a circle and goes through the center of it is the diameter.
the width of a circle
Approximately yes. Circumference is equal to pi times the diameter of the circle, which is 3.14159 times the diameter.
Pi (not "pie") is an important number in math, equal to about 3.14159625. It is the ratio between the circumference and the diameter of a circle; but this number also appears in many other places, even some where the relationship with a circle is not so obvious.
The measurement of 4 mm in diameter is equal to 0. 1575 inches in diameter. It is also equal to 0. 4 centimeters in diameter.
it would be the diameter of the smaller circle times sqrt 2