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September 18, 2014

September 18, 2014

Posted by **sona** on Tuesday, November 16, 2010 at 11:44am.

- maths -
**MathMate**, Tuesday, November 16, 2010 at 11:52amArea of a circle = πr²

Inner diameter = 12 cm

Inner radius = 6 cm

Outer radius = 6+1 = 7 cm

Cross sectional area of an annulus (ring)

= π(r2²-r1²)

=(7²-6²)π

=13π cm²

Volume for a 1 metre tube:

V=13π&100cm cm³

=1300 cm³

Mass ("weight")

=volume * density.

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