Question

Sendo A(1,2) e M(3,4), determine as coordenadas do ponto B, tal que M seja o ponto médio de AB

Answer 1

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$\large\begin{array}{l} \textsf{S\~ao dados os pontos}\\\\ \mathsf{A(1,\,2)~~e~~M(3,\,4).} \\\\\textsf{De acordo com o enunciado da tarefa, deseja-se encontrar}\\\textsf{as coordenadas do ponto }\mathsf{B(x_{_B},\,y_{_B}),}\textsf{ de modo que} \end{array}$


•   $\large\begin{array}{l} \textsf{M \'e o ponto m\'edio do segmento }\overline{\mathsf{AB}}: \end{array}$

$\large\begin{array}{l} \mathsf{x_{_M}=\dfrac{x_{_A}+x_{_B}}{2}}\\\\ \mathsf{2x_{_M}=x_{_A}+x_{_B}}\\\\ \mathsf{x_{_B}=2x_{_M}-x_{_A}}\\\\ \mathsf{x_{_B}=2\cdot 3-1}\end{array}$

$\large\begin{array}{l} \mathsf{x_{_B}=6-1}\\\\ \mathsf{x_{_B}=5\qquad\quad\checkmark}\\\\\\ \mathsf{y_{_M}=\dfrac{y_{_A}+y_{_B}}{2}}\\\\ \mathsf{2y_{_M}=y_{_A}+y_{_B}} \end{array}$

$\large\begin{array}{l} \mathsf{y_{_B}=2y_{_M}-y_{_A}}\\\\ \mathsf{y_{_B}=2\cdot 4-2}\\\\ \mathsf{y_{_B}=8-2}\\\\ \mathsf{y_{_B}=6\qquad\quad\checkmark} \end{array}$


$\large\begin{array}{l} \textsf{O ponto procurado \'e o ponto }\mathsf{B(5,\,6).}\\\\\\ \textsf{D\'uvidas? Comente.}\\\\\\ \textsf{Bons estudos! :-)} \end{array}$


Tags:  ponto médio simétrico simetria geometria analítica