1 Answer

TanThien · Answer 1 · 2023-01-12T23:32:59+0000

One inch is equivalent to 25.4 mm. Knowing this information we can use the rule of three:

$\begin{gathered} 25.4\operatorname{mm}\rightarrow1in \\ 80.81\operatorname{mm}\rightarrow x \end{gathered}$

Where x is the diameter in inches and is given by:

$\frac{80.81\operatorname{mm}\cdot1in}{25.4\operatorname{mm}}=3.18150\text{ inches}$

So the diameter is 3.18150 inches.

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