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SMK Teknologi dan Rekayasa

Soal 65 Volume Bangun Ruang


Volume\ udara\ dalam\ pipa\ yang\ panjangnya\ 4\ m,\ diameter\ luar\ 9\ cm,\\dan\ tebal\ pipa\ 1\ cm\ adalah\ ....\\a.\ \ 12800\ cm^{3}\ \ \ \ \ \ \ \ \ \ b.\ \ 13600\ cm^{3}\ \ \ \ \ \ \ \ \ \ c.\ \ 14200\ cm^{3}\\d.\ \ 15400\ cm^{3}\ \ \ \ \ \ \ \ \ \ e.\ \ 16900\ cm^{3}
Jawaban: d


Diameter\ tabung-dalam=9-(1+1)=7\ cm,\ sehingga\ r=3,5\ cm
\begin{array}{rcl}Volume\ udara\ dalam\ pipa&=&volume\ tabung-dalam\\\\&=& \pi r^{2}t\\\\&=&\frac{22}{7}\times 3,5\times 3,5\times 400\\\\&=&15400\ cm^{3}\end{array}

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