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\author{BriCàMatH}
\title{Devoir surveillé}
\date{22/01/2008}
\hypersetup{pdftitle={Devoir math. Classes de sixième},pdfsubject={Devoir de maths niveau sixième},pdfkeywords={aires,périmètres,cercles,polygones}}
\newcommand*{\pointilles}{\ldots\ldots\ldots}
\newcommand*{\Figure}[1]{\scriptsize\textit{fig. #1}}
\begin{document}
\titre{Devoir surveillé}
\DoubleLigne{\ladate{Le mardi 22/01/2008}}
\exo{Exercice 1.}
Calcule le périmètre de ces 2 figures (les figures ne sont pas représentées en vraie grandeur). Écris les calculs et les résultats sur ta feuille double. Tu donneras les résultats arrondis à 0,1 cm prés.\bigskip
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\exo{Exercice 2.}
Complète les pointillés dans les conversions suivantes :
\begin{align*}
5,4\text{ m}^2&=\pointilles\text{ dm}^2&2500\text{ cm}^2&=\pointilles\text{ dm}^2&0,7\text{ ha}&=\pointilles\text{ m}^2\\
0,2\text{ m}^2&=\pointilles\text{ cm}^2&0,56\ldots\ldots&=56\text{ m}^2&7800\text{ a}&=0,78\ldots\ldots
\end{align*}\par
\exo{Exercice 3.}
Calcule les aires de ces figures dans l'unité la plus appropriée (les figures ne sont pas représentées en vraie grandeur). Écris les calculs et les résultats sur ta feuille double.
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\Cotation*[linestyle=none][linewidth=0.5pt](3,0)(3,2){-0.5}{{\footnotesize3,5 cm}}
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\Cotation*[linestyle=none][linewidth=0.5pt](1.24,1.85)(4,0){0.5}{{\footnotesize55 mm}}
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\Cotation*[linestyle=none][linewidth=0.5pt](0,3)(2,3){0.5}{{\footnotesize5 cm}}
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\exo{Exercice 4.}
Un rectangle a une aire de $51\text{ cm}^2$. Sa longueur est de 8,5 cm.
\begin{Questions}
\item Calcule sa largeur.
\item Calcule son périmètre.
\item Quelle serait la longueur du côté d'un carré ayant le même périmètre que le rectangle ?
\end{Questions}
\exo{Exercice 5.}
5 carrés identiques sont «collés» les uns à la suite des autres pour former un rectangle très allongé.\newline
L'aire de l'un de ces carrés est de $4\text{ cm}^2$.\smallskip
Calcule le \emph{périmètre} du rectangle obtenu (tu peux faire une figure à main levée pour t'aider dans ton raisonnement et tes explications).
\exo{Exercice 6.}
Dessine sur ta feuille une figure dont le périmètre est 10 cm et dont l'aire est la plus petite possible.
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