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Sagot :
let's first off convert the mixed fractions to improper fractions, and then get its volume, bearing in mind that the radius is half the diameter.
[tex]\stackrel{mixed}{19\frac{3}{4}}\implies \cfrac{19\cdot 4+3}{4}\implies \stackrel{improper}{\cfrac{79}{4}} ~\hfill \stackrel{mixed}{1\frac{2}{5}}\implies \cfrac{1\cdot 5+2}{5}\implies \stackrel{improper}{\cfrac{7}{5}} \\\\[-0.35em] ~\dotfill[/tex]
[tex]\textit{volume of a cylinder}\\\\ V=\pi r^2 h~~ \begin{cases} r=radius\\ h=height\\[-0.5em] \hrulefill\\ h=\frac{79}{4}\\[1em] r=\frac{7}{5}\cdot \frac{1}{2}\\ \qquad \frac{7}{10} \end{cases}\implies \begin{array}{llll} V=\pi \left( \cfrac{7}{10} \right)^2\left( \cfrac{79}{4} \right)\\\\ V=(3.14) \left( \cfrac{7}{10} \right)^2\left( \cfrac{79}{4} \right)\\\\ V\approx 30.39 \end{array}[/tex]
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