A professora de Matematica desenhou no quadro da sala de aula o seginte quadro
Ealm seguida realizou o diálogo com sua turma.
Professora: turma, se a medida do lado desse quadrado sobre, o perímetro dobra?
Turma: sim!
De acordo com o desenho e o diálogo da professora com a turma, pode-se afirmar que a resposta da turma está correta ou não? Justifique sua resposta com cálculo.
Anexos:
juniosouzajh:
vibrabra
Respostas
respondido por:
447
Resposta:
Seampliarmos ou reduzirmos, igualmente , as medidas dos lados de um quadrado oi de um retângulo, seus perímetros são ampliados ou reduzidos na mesma proporção, enquanto as suas áreas não são.
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢠⠞⠁⠀⣀⡾⠋⠀⠀⢹⣼⠁⢠⡇⠀⡴⠋⠀⠀⡼
⠀⠀⠀⠀⢠⠊⠑⢦⠀⡴⠋⢀⣠⠞⠉⠀⠀⠀⣠⣿⠧⣄⡾⠁⡼⠁⣀⣤⠾⡁
⠀⠀⠀⠀⢸⠀⠀⣨⠟⠁⢠⡞⠁⠀⠀⠀⣠⡾⠛⠁⠀⣿⠃⣰⠃⣴⠋⠀⠀⣷
⠀⠀⠀⠀⣸⢠⠞⠁⠀⢠⠏⠀⠀⢀⡴⠋⠁⠀⢀⣠⡴⠿⣶⡇⢰⠇⠀⠀⢠⠇
⠀⠀⠀⢠⢿⠏⠀⠀⠀⠉⠀⠀⣠⠞⠁⠀⡴⠚⠉⠁⠀⢀⡟⠀⣼⠀⠀⠀⢸⠀
⠀⠀⠀⡾⣼⢀⠀⠀⠀⠀⠀⠈⠉⠀⣠⠞⠁⠀⠀⢀⡴⠋⠙⢼⠃⠀⠀⠀⣸⠀
⠀⠀⠀⡇⠉⡎⠀⣰⠃⠀⠀⠀⠀⠀⠁⠀⠀⠀⡼⠉⠀⠀⠀⠘⠂⠀⠀⣠⠇⠀
⠀⠀⠀⡇⢸⠀⣰⠃⠀⡴⠀⠀⠀⠀⠀⠀⣠⠞⠁⠀⠀⠀⠀⠀⠀⣠⠖⠁⠀⠀
⠀⠀⢸⠁⡏⢠⠃⢀⠞⠀⠀⠀⠀⠀⠀⢸⠁⠀⠀⠀⠀⢀⣠⠖⠋⠁⠀⠀⠀⠀
⠀⠀⡞⠀⠃⡎⢀⠏⠀⠀⠀⠀⠀⠀⢀⡏⠀⣀⡤⠴⠚⠉⠀⠀⠀⠀⠀⠀⠀⠀
⡴⢺⠇⠀⠀⠀⠞⠀⠀⠀⠀⠀⠀⢀⡾⠒⠋⠁⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⡇⠘⣆⠀⠀⠀⠀⠀⠀⠀⠀⠀⢠⠞⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⢳⡀⠘⢦⡀⠀⠀⠀⠀⠀⠀⡰⠋⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠳⣄⠀⠙⠲⣤⣀⣠⠴⠊⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢠⠞⠁⠀⣀⡾⠋⠀⠀⢹⣼⠁⢠⡇⠀⡴⠋⠀⠀⡼
⠀⠀⠀⠀⢠⠊⠑⢦⠀⡴⠋⢀⣠⠞⠉⠀⠀⠀⣠⣿⠧⣄⡾⠁⡼⠁⣀⣤⠾⡁
⠀⠀⠀⠀⢸⠀⠀⣨⠟⠁⢠⡞⠁⠀⠀⠀⣠⡾⠛⠁⠀⣿⠃⣰⠃⣴⠋⠀⠀⣷
⠀⠀⠀⠀⣸⢠⠞⠁⠀⢠⠏⠀⠀⢀⡴⠋⠁⠀⢀⣠⡴⠿⣶⡇⢰⠇⠀⠀⢠⠇
⠀⠀⠀⢠⢿⠏⠀⠀⠀⠉⠀⠀⣠⠞⠁⠀⡴⠚⠉⠁⠀⢀⡟⠀⣼⠀⠀⠀⢸⠀
⠀⠀⠀⡾⣼⢀⠀⠀⠀⠀⠀⠈⠉⠀⣠⠞⠁⠀⠀⢀⡴⠋⠙⢼⠃⠀⠀⠀⣸⠀
⠀⠀⠀⡇⠉⡎⠀⣰⠃⠀⠀⠀⠀⠀⠁⠀⠀⠀⡼⠉⠀⠀⠀⠘⠂⠀⠀⣠⠇⠀
⠀⠀⠀⡇⢸⠀⣰⠃⠀⡴⠀⠀⠀⠀⠀⠀⣠⠞⠁⠀⠀⠀⠀⠀⠀⣠⠖⠁⠀⠀
⠀⠀⢸⠁⡏⢠⠃⢀⠞⠀⠀⠀⠀⠀⠀⢸⠁⠀⠀⠀⠀⢀⣠⠖⠋⠁⠀⠀⠀⠀
⠀⠀⡞⠀⠃⡎⢀⠏⠀⠀⠀⠀⠀⠀⢀⡏⠀⣀⡤⠴⠚⠉⠀⠀⠀⠀⠀⠀⠀⠀
⡴⢺⠇⠀⠀⠀⠞⠀⠀⠀⠀⠀⠀⢀⡾⠒⠋⠁⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⡇⠘⣆⠀⠀⠀⠀⠀⠀⠀⠀⠀⢠⠞⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⢳⡀⠘⢦⡀⠀⠀⠀⠀⠀⠀⡰⠋⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠳⣄⠀⠙⠲⣤⣀⣠⠴⠊⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢠⠞⠁⠀⣀⡾⠋⠀⠀⢹⣼⠁⢠⡇⠀⡴⠋⠀⠀⡼
⠀⠀⠀⠀⢠⠊⠑⢦⠀⡴⠋⢀⣠⠞⠉⠀⠀⠀⣠⣿⠧⣄⡾⠁⡼⠁⣀⣤⠾⡁
⠀⠀⠀⠀⢸⠀⠀⣨⠟⠁⢠⡞⠁⠀⠀⠀⣠⡾⠛⠁⠀⣿⠃⣰⠃⣴⠋⠀⠀⣷
⠀⠀⠀⠀⣸⢠⠞⠁⠀⢠⠏⠀⠀⢀⡴⠋⠁⠀⢀⣠⡴⠿⣶⡇⢰⠇⠀⠀⢠⠇
⠀⠀⠀⢠⢿⠏⠀⠀⠀⠉⠀⠀⣠⠞⠁⠀⡴⠚⠉⠁⠀⢀⡟⠀⣼⠀⠀⠀⢸⠀
⠀⠀⠀⡾⣼⢀⠀⠀⠀⠀⠀⠈⠉⠀⣠⠞⠁⠀⠀⢀⡴⠋⠙⢼⠃⠚⠉⠀⠀⠀⠀⠀⠀⠀⠀
⡴⢺⠇⠀⠀⠀⠞⠀⠀⠀⠀⠀⠀⢀⡾⠒⠋⠁⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⡇⠘⣆⠀⠀⠀⠀⠀⠀⠀⠀⠀⢠⠞⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⢳⡀⠘⢦⡀⠀⠀⠀⠀⠀⠀⡰⠋⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠳⣄⠀⠙⠲⣤⣀⣠⠴⠊⠀
⠀⠀⠀⠀⢸⠁⢠⡞⠁⠀⠀⠀⣠⡾⠛⠁⠀
⠀⠀⠀⠀⠀⢠⠏⠀⠀⢀⡴⠋⠁⠀
⠀⠀⠀⢠⢿⠏⠀⠀⠀⠉⠀⠀⠀
⠀⠀⠀⡾⣼⢀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⡇⠉⡎⠀⣰⠃⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⡇⢸⠀⣰⠃⠀⡴⠀⠀⠀⠀⠀⠀⣠⠞⠀⠀⠀⠀⠀⠀
⠀⠀⢸⠁⡏⢠⠃⢀⠞⠀⠀⠀⠀⠀⠀⢸⠁⠀⠀⠀
⠀⠀⡞⠀⠃⡎⢀⠏⠀⠀⠀⠀⠀⠀⢀⡏⠀⠀⠀⠀⠀⠀⠀
⡴⢺⠇⠀⠀⠀⠞⠀⠀⠀⠀⠀⠀⢀⡾⠀⠀⠀⠀⠀⠀⠀⠀⠀
⡇⠘⣆⠀⠀⠀⠀⠀⠀⠀⠀⠀⢠⠞⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⢳⡀⠘⢦⡀⠀⠀⠀⠀⠀⠀⡰⠋⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠳⣄⠀⠙⠲⣤⣀⣠⠴⠊⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢠⠞⠁⠀⣀⡾⠋⠀⠀⢹⣼⠁⢠⡇⠀⡴⠋⠀⠀⡼
⠀⠀⠀⠀⢠⠊⠑⢦⠀⡴⠋⢀⣠⠞⠉⠀⠀⠀⣠⣿⠧⣄⡾⠁⡼⠁⣀⣤⠾⡁
⠀⠀⠀⠀⢸⠀⠀⣨⠟⠁⢠⡞⠁⠀⠀⠀⣠⡾⠛⠁⠀⣿⠃⣰⠃⣴⠋⠀⠀⣷
⠀⠀⠀⠀⣸⢠⠞⠁⠀⢠⠏⠀⠀⢀⡴⠋⠁⠀⢀⣠⡴⠿⣶⡇⢰⠇⠀⠀⢠⠇
⠀⠀⠀⢠⢿⠏⠀⠀⠀⠉⠀⠀⣠⠞⠁⠀⡴⠚⠉⠁⠀⢀⡟⠀⣼⠀⠀⠀⢸⠀
⠀⠀⠀⡾⣼⢀⠀⠀⠀⠀⠀⠈⠉⠀⣠⠞⠁⠀⠀⢀⡴⠋⠙⢼⠃⠀⠀⠀⣸⠀
⠀⠀⠀⡇⠉⡎⠀⣰⠃⠀⠀⠀⠀⠀⠁⠀⠀⠀⡼⠉⠀⠀⠀⠘⠂⠀⠀⣠⠇⠀
⠀⠀⠀⡇⢸⠀⣰⠃⠀⡴⠀⠀⠀⠀⠀⠀⣠⠞⠁⠀⠀⠀⠀⠀⠀⣠⠖⠁⠀⠀
⠀⠀⢸⠁⡏⢠⠃⢀⠞⠀⠀⠀⠀⠀⠀⢸⠁⠀⠀⠀⠀⢀⣠⠖⠋⠁⠀⠀⠀⠀
⠀⠀⡞⠀⠃⡎⢀⠏⠀⠀⠀⠀⠀⠀⢀⡏⠀⣀⡤⠴⠚⠉⠀⠀⠀⠀⠀⠀⠀⠀
⡴⢺⠇⠀⠀⠀⠞⠀⠀⠀⠀⠀⠀⢀⡾⠒⠋⠁⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⡇⠘⣆⠀⠀⠀⠀⠀⠀⠀⠀⠀⢠⠞⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⢳⡀⠘⢦⡀⠀⠀⠀⠀⠀⠀⡰⠋⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠳⣄⠀⠙⠲⣤⣀⣠⠴⠊⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢠⠞⠁⠀⣀⡾⠋⠀⠀⢹⣼⠁⢠⡇⠀⡴⠋⠀⠀⡼
⠀⠀⠀⠀⢠⠊⠑⢦⠀⡴⠋⢀⣠⠞⠉⠀⠀⠀⣠⣿⠧⣄⡾⠁⡼⠁⣀⣤⠾⡁
⠀⠀⠀⠀⢸⠀⠀⣨⠟⠁⢠⡞⠁⠀⠀⠀⣠⡾⠛⠁⠀⣿⠃⣰⠃⣴⠋⠀⠀⣷
⠀⠀⠀⠀⣸⢠⠞⠁⠀⢠⠏⠀⠀⢀⡴⠋⠁⠀⢀⣠⡴⠿⣶⡇⢰⠇⠀⠀⢠⠇
⠀⠀⠀⢠⢿⠏⠀⠀⠀⠉⠀⠀⣠⠞⠁⠀⡴⠚⠉⠁⠀⢀⡟⠀⣼⠀⠀⠀⢸⠀
⠀⠀⠀⡾⣼⢀⠀⠀⠀⠀⠀⠈⠉⠀⣠⠞⠁⠀⠀⢀⡴⠋⠙⢼⠃⠀⠀⠀⣸⠀
⠀⠀⠀⡇⠉⡎⠀⣰⠃⠀⠀⠀⠀⠀⠁⠀⠀⠀⡼⠉⠀⠀⠀⠘⠂⠀⠀⣠⠇⠀
⠀⠀⠀⡇⢸⠀⣰⠃⠀⡴⠀⠀⠀⠀⠀⠀⣠⠞⠁⠀⠀⠀⠀⠀⠀⣠⠖⠁⠀⠀brigado
⠀⠀⢸⠁⡏⢠⠃⢀⠞⠀⠀⠀⠀⠀⠀⢸⠁⠀⠀⠀⠀⢀⣠⠖⠋⠁⠀⠀⠀⠀
⠀⠀⡞⠀⠃⡎⢀⠏⠀⠀⠀⠀⠀⠀⢀⡏⠀⣀⡤⠴⠚⠉⠀⠀⠀⠀⠀⠀⠀⠀
⡴⢺⠇⠀⠀⠀⠞⠀⠀⠀⠀⠀⠀⢀⡾⠒⠋⠁⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⡇⠘⣆⠀⠀⠀⠀⠀⠀⠀⠀⠀⢠⠞⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⢳⡀⠘⢦⡀⠀⠀⠀⠀⠀⠀⡰⠋⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠳⣄⠀⠙⠲⣤⣀⣠⠴⠊⠀
respondido por:
136
A turma está correta.
Primeiramente, é importante sabermos a definição de perímetro:
- O perímetro é igual a soma de todos os lados de um quadrado.
Vamos calcular o perímetro do quadrado de lado 7 centímetros. Dito isso, temos que:
P = 7 + 7 + 7 + 7
P = 28 centímetros.
Agora, devemos dobrar essa medida. Isso significa que o novo quadrado possui lados iguais a 7.2 = 14 centímetros. Então, o perímetro desse novo quadrado é:
P' = 14 + 14 + 14 + 14
P' = 56 centímetros.
Observe que P' = 2.P, ou seja, 56 = 2.28. Portanto, podemos afirmar que o perímetro dobra e a turma está correta.
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢠⠞⠁⠀⣀⡾⠋⠀⠀⢹⣼⠁⢠⡇⠀⡴⠋⠀⠀⡼
⠀⠀⠀⠀⢠⠊⠑⢦⠀⡴⠋⢀⣠⠞⠉⠀⠀⠀⣠⣿⠧⣄⡾⠁⡼⠁⣀⣤⠾⡁
⠀⠀⠀⠀⢸⠀⠀⣨⠟⠁⢠⡞⠁⠀⠀⠀⣠⡾⠛⠁⠀⣿⠃⣰⠃⣴⠋⠀⠀⣷
⠀⠀⠀⠀⣸⢠⠞⠁⠀⢠⠏⠀⠀⢀⡴⠋⠁⠀⢀⣠⡴⠿⣶⡇⢰⠇⠀⠀⢠⠇
⠀⠀⠀⢠⢿⠏⠀⠀⠀⠉⠀⠀⣠⠞⠁⠀⡴⠚⠉⠁⠀⢀⡟⠀⣼⠀⠀⠀⢸⠀
⠀⠀⠀⡾⣼⢀⠀⠀⠀⠀⠀⠈⠉⠀⣠⠞⠁⠀⠀⢀⡴⠋⠙⢼⠃⠀⠀⠀⣸⠀
⠀⠀⠀⡇⠉⡎⠀⣰⠃⠀⠀⠀⠀⠀⠁⠀⠀⠀⡼⠉⠀⠀⠀⠘⠂⠀⠀⣠⠇⠀
⠀⠀⠀⡇⢸⠀⣰⠃⠀⡴⠀⠀⠀⠀⠀⠀⣠⠞⠁⠀⠀⠀⠀⠀⠀⣠⠖⠁⠀⠀brigado
⠀⠀⢸⠁⡏⢠⠃⢀⠞⠀⠀⠀⠀⠀⠀⢸⠁⠀⠀⠀⠀⢀⣠⠖⠋⠁⠀⠀⠀⠀
⠀⠀⡞⠀⠃⡎⢀⠏⠀⠀⠀⠀⠀⠀⢀⡏⠀⣀⡤⠴⠚⠉⠀⠀⠀⠀⠀⠀⠀⠀
⡴⢺⠇⠀⠀⠀⠞⠀⠀⠀⠀⠀⠀⢀⡾⠒⠋⠁⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⡇⠘⣆⠀⠀⠀⠀⠀⠀⠀⠀⠀⢠⠞⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⢳⡀⠘⢦⡀⠀⠀⠀⠀⠀⠀⡰⠋⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠳⣄⠀⠙⠲⣤⣀⣠⠴⠊⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢠⠞⠁⠀⣀⡾⠋⠀⠀⢹⣼⠁⢠⡇⠀⡴⠋⠀⠀⡼
⠀⠀⠀⠀⢠⠊⠑⢦⠀⡴⠋⢀⣠⠞⠉⠀⠀⠀⣠⣿⠧⣄⡾⠁⡼⠁⣀⣤⠾⡁
⠀⠀⠀⠀⢸⠀⠀⣨⠟⠁⢠⡞⠁⠀⠀⠀⣠⡾⠛⠁⠀⣿⠃⣰⠃⣴⠋⠀⠀⣷
⠀⠀⠀⠀⣸⢠⠞⠁⠀⢠⠏⠀⠀⢀⡴⠋⠁⠀⢀⣠⡴⠿⣶⡇⢰⠇⠀⠀⢠⠇
⠀⠀⠀⢠⢿⠏⠀⠀⠀⠉⠀⠀⣠⠞⠁⠀⡴⠚⠉⠁⠀⢀⡟⠀⣼⠀⠀⠀⢸⠀
⠀⠀⠀⡾⣼⢀⠀⠀⠀⠀⠀⠈⠉⠀⣠⠞⠁⠀⠀⢀⡴⠋⠙⢼⠃⠀⠀⠀⣸⠀
⠀⠀⠀⡇⠉⡎⠀⣰⠃⠀⠀⠀⠀⠀⠁⠀⠀⠀⡼⠉⠀⠀⠀⠘⠂⠀⠀⣠⠇⠀
⠀⠀⠀⡇⢸⠀⣰⠃⠀⡴⠀⠀⠀⠀⠀⠀⣠⠞⠁⠀⠀⠀⠀⠀⠀⣠⠖⠁⠀⠀brigado
⠀⠀⢸⠁⡏⢠⠃⢀⠞⠀⠀⠀⠀⠀⠀⢸⠁⠀⠀⠀⠀⢀⣠⠖⠋⠁⠀⠀⠀⠀
⠀⠀⡞⠀⠃⡎⢀⠏⠀⠀⠀⠀⠀⠀⢀⡏⠀⣀⡤⠴⠚⠉⠀⠀⠀⠀⠀⠀⠀⠀
⡴⢺⠇⠀⠀⠀⠞⠀⠀⠀⠀⠀⠀⢀⡾⠒⠋⠁⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⡇⠘⣆⠀⠀⠀⠀⠀⠀⠀⠀⠀⢠⠞⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⢳⡀⠘⢦⡀⠀⠀⠀⠀⠀⠀⡰⠋⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠳⣄⠀⠙⠲⣤⣀⣠⠴⠊⠀
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