The circumference is 42.83 because
circumference = 2 x pi x r
2 x 2.1415927 x 10 = 42.83
Improved answer:
Circumference of a circle = 2*pi*radius or pi*diameter
Circumference = 20*pi = 62.83185307 units or 63 to the nearest unit.
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formula for circumference is 2(pi)(radius) therefore: 10=2(pi)(radius) solving: radius = 10 / (2 pi) radius = 1.59
A circle with a radius of 10 m has a circumference of 62.83 m.
Circumference = 2 x pie x radius Therefore, radius = 10/2/pie =1.6
If the circumference of a circle is 10 feet the radius is: about 1.592 feet. For this type of calculation, divide the circumference by Pi (about 3.1416). This gives you the diameter. Next, divide the diameter by two to get the radius.
A circle with radius of 3 inches doesn't have a diameter of 10 inches. If the radius is 3, then the diameter is 6, and the circumference is (6 pi) = 18.85 . (rounded) If the diameter is 10, then the radius is 5, and the circumference is (10 pi) = 31.42 . (rounded) The diameter is always double the radius, and the radius is always half of the diameter.