Упражнение 875

Решение:

\(\pi=3{,}14\)

• \(\begin{array}[t]{lcl}{\largeПри}\ r=36\ {\largeсм}&&C=2\pi{r}=2\cdot3{,}14\cdot36=6{,}28\cdot36=226{,}08\ {\large(см)}\end{array}\)

• \(\begin{array}{}1)\\[3.5ex]\\\end{array}\begin{array}{r}\times\begin{array}{r}3{,}14\\2\\\hline\end{array}\\\begin{array}{r}6{,}28\end{array}\end{array}\)
• \(\begin{array}{}2)\\[10.5ex]\\\end{array}\begin{array}{r}\times\begin{array}{r}6{,}28\\36\\\hline\end{array}\phantom{0}\\\begin{array}{r}+\begin{array}{r}3768\\1884\phantom{0}\\\hline\end{array}\\\begin{array}{r}226{,}08\end{array}\end{array}\end{array}\)

• \(\begin{array}[t]{lcl}{\largeПри}\ r=0{,}44\ {\largeсм}&&C=2\pi{r}=2\cdot3{,}14\cdot0{,}44=6{,}28\cdot0{,}44=2{,}7632\ {\large(см)}\end{array}\)

• \(\begin{array}{}1)\\[3.5ex]\\\end{array}\begin{array}{r}\times\begin{array}{r}3{,}14\\2\\\hline\end{array}\\\begin{array}{r}6{,}28\end{array}\end{array}\)
• \(\begin{array}{}2)\\[10.5ex]\\\end{array}\begin{array}{r}\times\begin{array}{r}6{,}28\\0{,}44\\\hline\end{array}\phantom{0}\\\begin{array}{r}+\begin{array}{r}2512\\2512\phantom{0}\\\hline\end{array}\\\begin{array}{r}2{,}7632\end{array}\end{array}\end{array}\)

• \(\begin{array}[t]{lcl}{\largeПри}\ r=125\ {\largeкм}&&C=2\pi{r}=2\cdot3{,}14\cdot125=6{,}28\cdot125=785\ {\large(км)}\end{array}\)

• \(\begin{array}{}1)\\[3.5ex]\\\end{array}\begin{array}{r}\times\begin{array}{r}3{,}14\\2\\\hline\end{array}\\\begin{array}{r}6{,}28\end{array}\end{array}\)
• \(\begin{array}{}2)\\[14.5ex]\\\end{array}\begin{array}{r}\times\begin{array}{r}6{,}28\\125\\\hline\end{array}\phantom{0}\\\begin{array}{r}+\begin{array}{r}3140\\1256\phantom{0}\\628\phantom{00}\\\hline\end{array}\\\begin{array}{r}785{,}00\end{array}\end{array}\end{array}\)