Devoir Libre 02 S01, produit scalaire et barycentre

📅 November 24, 2025   |   👁️ Views: 468   |   📝 3 exercises   |   ❓ 26 questions



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This PDF covers maths exam for 1-bac-science students. It includes 3 exercises and 26 questions. Designed to help you master the topic efficiently.

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\def\examtitle{Devoir Libre 02 - S01, par Prof : TABRART Abdelaziz}
\def\schoolname{\textbf{Lycée :} Taghzirt}
\def\academicyear{2025/2026}
\def\subject{Mathématiques}
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\textbf{\underline{Le plan est rapporté à un repère ~$ (O; \overrightarrow{i}, \overrightarrow{j}) $~}}
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% Exercise 1
\printexo{1}{}{
On considère les points :
~$
A \left( \sqrt{3} - 1; \sqrt{3} + 1 \right), \quad B(-2; 2), \quad C(1; -1)
$~

\begin{enumerate}
    \item
    \begin{enumerate}
        \item Montrer que ~$ OA = 2\sqrt{2} $~ et calculer la distance ~$ OB $~.
        \item Déduire la nature du triangle ~$ OAB $~.
    \end{enumerate}

    \item
    \begin{enumerate}
        \item Calculer ~$ \overrightarrow{OA} \cdot \overrightarrow{OB} $~ et ~$ \det(\overrightarrow{OA}, \overrightarrow{OB}) $~.
        \item Déduire ~$ \cos(\overrightarrow{OA}, \overrightarrow{OB}) $~ et ~$ \sin(\overrightarrow{OA}, \overrightarrow{OB}) $~.
        \item Déterminer la mesure de l'angle orienté ~$ (\overrightarrow{OA}, \overrightarrow{OB}) $~.
    \end{enumerate}

    \item Déterminer l’équation cartésienne de la hauteur du triangle ~$ ABC $~ qui passe par ~$ A $~.
\end{enumerate}
}

% Exercise 2
\printexo{2}{}{
Soit ~$ ABC $~ un triangle et ~$ J $~ un point tel que ~$ \overrightarrow{BI} = 2\overrightarrow{BC} $~. \\
Soit ~$ G $~ le barycentre des points pondérés ~$ \{(A; 1), (B; -1), (C; 2)\} $~.
\begin{enumerate}
    \item Montrer que ~$ J = \text{Bary}\{(B; -1), (C; 2)\} $~.
    \item Construire le point ~$ K = \text{Bary}\{(A; 1), (C; 2)\} $~.
    \item Montrer que ~$ G $~ est le milieu du segment ~$[AJ]$~, puis construire le point ~$ G $~.
    \item Montrer que les points ~$ G, B $~ et ~$ K $~ sont alignés.
    \item Montrer que le point ~$ K $~ est le centre de gravité du triangle ~$ ABJ $~.
    \item Sachant que ~$ A(1; 2) $~, ~$ B(-1; 3) $~ et ~$ C(-1; 0) $~, déterminer les coordonnées de ~$ G $~.
    \item Déterminer l'ensemble des points ~$ M $~ du plan tels que :
    ~$ \| \overrightarrow{MA} - \overrightarrow{MB} + 2\overrightarrow{MC} \| = 2 \times \| -\overrightarrow{MB} + 2\overrightarrow{MC} \| $~.
\end{enumerate}
}

% Exercise 3
\printexo{3}{}{
On considère ~$ A(1; 3) $~ et ~$ B(3; 1) $~ deux points du plan, et on considère ~$ (\mathcal C) $~ l’ensemble des points ~$ M(x; y) $~ tel que : ~$ \overrightarrow{MA} \cdot \overrightarrow{MB} = 3 $~.

\begin{enumerate}
    \item
    \begin{enumerate}
        \item Montrer que l’équation de l’ensemble ~$ (\mathcal C) $~ s’écrit sous la forme : \\
        ~$ x^2 + y^2 - 4x - 4y + 3 = 0 $~.
        \item Vérifier que ~$ (\mathcal C) $~ est un cercle de centre ~$ \Omega $~ et de rayon ~$ R $~ à déterminer.
    \end{enumerate}

    \item
    \begin{enumerate}
        \item Vérifier que ~$ H(1; 4) \in (\mathcal C) $~.
        \item Déterminer une équation de la droite ~$ (D) $~ tangente au cercle ~$ (\mathcal C) $~ en ~$ H $~.
    \end{enumerate}

    \item Soit ~$ (\Delta) $~ la droite passant par ~$ C(0; 1) $~ et de vecteur normal ~$ \overrightarrow{n}(1; 3) $~.
    \begin{enumerate}
        \item Montrer que l’équation cartésienne de ~$ (\Delta) $~ est ~$ x + 3y - 3 = 0 $~.
        \item Calculer ~$ d(\Omega; (\Delta)) $~ puis déduire que ~$ (\Delta) $~ coupe le cercle ~$ (\mathcal C) $~ en deux points ~$ E $~ et ~$ F $~.
        \item Déterminer les coordonnées de ~$ E $~ et ~$ F $~.
        \item Résoudre graphiquement le système :
        ~$
        \begin{cases}
            x + 3y - 3 > 0 \\
            x^2 + y^2 - 4x - 4y + 3 \leq 0
        \end{cases}
        $~
    \end{enumerate}
\end{enumerate}
}

\end{document}



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Frequently Asked Questions

What chapters or courses does this exam cover?
This exam covers: Le Barycentre dans le plan, المرجح في المستوى, الجداء السلمي وتطبيقاته. It is designed to test understanding of these topics.

How many questions are in this exam?
The exam contains approximately 26 questions.

Is this exam aligned with the official curriculum?
Yes, it follows the 1-bac-science maths guidelines.

What topics are covered in this course?
The course "Produit Scalaire" covers key concepts of maths for 1-bac-science. Designed to help students master the curriculum.

Is this course suitable for beginners?
Yes, the material is structured to be accessible while providing depth for advanced learners.

Are there exercises or practice problems?
This resource includes 3 exercise(s) to reinforce learning.

Does this course include solutions?
Solutions are available separately.


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