Circumference of a cylinder is 4 cm and height is 1 meter , find its radius !?

C = 2 × π × r

4 = 2 × π × r

2 = π × r

r = 2 / π

r = = 0.6366197723675814 cm

C = 2 pi r

r = C / 2 pi

r = 4 cm / (2x3.1411592.....)

r = 0.6366 ... cm

Ignore the height and so its radius is 4/(2*pi) = 0.64 cm rounded to the nearest hundredth

Radius r = Circumference C/(2π)

r = 4/(2π) ~ 0.64 cm

Height not relevant

C = 2 × pi × r

4 = 2 × 3.1416 × r

2 = 3.1416 × r

r = 2 / 3.1416

r = 0.636618... cm

The height is irrelevant.

You just need the circumference formula for the circle at the end:

C = 2 x pi x r

4 = 2 x 3.142 x r

r = 0.637 cm

4 = 6.283r

r =

Ignore the height... the cross-section is a circle which you said has a circumference of 4 cm.

C = 2πr

r = C/(2π)

So just divide the circumference by 2π to get the radius.

r = 4/(2π)

r = 2/π

r ≈ 0.64 cm

P.S. You asked this question previously and chose a Best Answer. Is there a reason you needed to ask it again?