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January 25, 2015

January 25, 2015

Posted by **sona** on Tuesday, November 16, 2010 at 12:09pm.

- maths -
**sona**, Tuesday, November 16, 2010 at 12:12pmArea of a circle = ðr²

Inner diameter = 12 cm

Inner radius = 6 cm

Outer radius = 6+1 = 7 cm

Cross sectional area of an annulus (ring)

= ð(r2²-r1²)

=(7²-6²)ð

=13ð cm²

Volume for a 1 metre tube:

V=13ð&100cm cm³

=1300 cm³

Mass ("weight")

=volume * density.

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