1.4 million kilometers (870,000 miles).
it has none
The Sun is about 1,390,000 kilometers in diameter. The NBA basketball is about 0.238506 meters in diamter. The scale factor is about 1,390,000,000 to 0.238506, or about 5,827,945,628 to 1 or about 5.8 billion to one.
it is the circumfrance of a circle divided by pi.
6 in.
d = 2r
100.53 inches
diameter = 128/pi
circumference = pi*40cm
The name of half a diameter is a radius.
circumference = 15*pi cm
Any value between 0 and 12 cm.
circumference = pi*diameter or pi = circumference/diameter