Oficina de Matemática - 7º ano - Recuperação do 2º trimestre
Autor: Escola Terra Mater | Publicado: 2012-09-12T07:52:00-07:00

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Nome:__________________________________________________

Turma: 7 º Ano

Data entrega: 14/09/2012

OBS: Entregar as instruções mais a tarefa executada. 



Construindo
esquadros.



Construir um esquadro formado pelos ângulos de 30°,
60° e 90°;

⇒

Construir um esquadro formado pelos ângulos de 45°,
45° e 90°.

Recursos:

Papel sulfite, régua, tesoura, canetas de cor preta
e vermelha, lápis de cor&nbsp;&nbsp;preto e vermelho e&nbsp;transferidor.

Atividade:

1.Dado&nbsp;uma&nbsp;folha sulfite, tomar&nbsp;um
quadrado.

2.Marcar os vértices A, B, C&nbsp;e D, conforme
figura&nbsp;número 2.

3.Dobrar o quadrado ao meio coincidindo
os&nbsp;segmentos&nbsp;AB e CD. Vincar bem.

4.Abrir o&nbsp;quadrado. Unir o&nbsp;vértice
C&nbsp;com a linha vincada, formando uma linha de dobragem que
passe pelo vértice D.

5.Unir o&nbsp;vértice&nbsp;B com o vértice C.

6.Dobrar&nbsp;a parte restante&nbsp;do quadrado
sobre&nbsp;o segmento&nbsp;formado pela união dos vértices C e B.

&nbsp;A altura do triângulo formado divide a figura
em dois outros triângulos.

7.Usando&nbsp;o&nbsp;transferidor,&nbsp;medir,&nbsp;marcar&nbsp;e&nbsp;pintar&nbsp;os&nbsp;ângulos&nbsp;do&nbsp;triângulo&nbsp;menor,utilizando a cor
preta.

8.Usando novamente o&nbsp;transferidor,&nbsp;medir,
marcar&nbsp;e&nbsp;pintar os&nbsp;ângulos&nbsp;do triângulo maior utilizando
a cor vermelha.

&nbsp;



&nbsp;Figura 10 – Seqüência Didática VIII.Fonte: BIANCHINI; MONDO, 2008.

Conclusão:

Ao concluir esta
atividade, proporciona-se ao aluno um material que pode vir a substituir um recurso de medida, que recebe o nome de esquadro,
construído a&nbsp;partir da técnica das&nbsp;dobraduras.