According to wikipedia:
Smarties are oblate spheroids with a minor axis of about 5 mm (0.2 in) and a major axis of about 12 mm (0.5 in).
What is the volume of one smartie?
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Calcutlate the sphere volume with the major radius and then multiply the result by minor/major.
With $r=5/2\text{ mm}$ and $R=12/2\text{ mm}$
$$V=\frac43\pi R^2r=377\;\text{mm}^3$$
Matthias
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that sounds far too big for a smartie - shouldn't r=2.5mm and R=6mm "radius" not 'diameter"? – user247608 May 12 '16 at 06:49
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Oh I thougt that would be the radius each. Thx – Matthias May 12 '16 at 06:49
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I thought smarties were about the size of a shirt button, so those numbers look good. Good to know! – user247608 May 12 '16 at 06:51