Guião Geogebra

Construção de homotetias-HomotetiasGuião - Geogebra

Abrir (Google) Geogebra

Desenha um polígono à tua escolha.

Retirar o fundo quadriculado e os eixos, para isso no botão direito do rato fazer:

Assinala um ponto O (será o centro da homotetia)

Cada vez que terminas uma tarefa volta sempre à seta (Mover):

Através de uma homotetia de centro em O, constrói a imagem do polígono usando as seguintes razões de semelhança:

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Determina as áreas das figuras construídas, para isso seleciona o símbolo à direita e clica dentro de cada uma das figuras que construíste.

Determina: 10.1. a razão dos perímetros entre a figura inicial e a figura ampliada 10.2. a razão dos perímetros entre a figura inicial e a figura reduzida. 10.3. O que concluíste?

Mede os perímetros de cada uma das figuras construídas, para isso seleciona o símbolo à direita e clica dentro de cada uma das figuras que construíste

Determina:9.1. A razão das áreas entre a figura inicial e a figura ampliada. 9.2. A razão das áreas entre a figura inicial e a figura reduzida. 9.3. O que concluíste?

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Deverás seguir as seguintes orientações para a entrega do teu trabalho no Classroom: • Cria um documento no Word ou um PowerPoint onde deves identificar o teu nome, número e turma. • No documento, responde às questões colocadas anteriormente. • Guarda a tua construção no documento e, para isso, segue os seguintes passos:  - No Geogebra, clica no canto superior direito em  - Seleciona Exportar imagem e, em seguida faz Download (a imagem encontra-se na área de transferência). Copia e cola a imagem obtida no documento que criaste. • Entrega o ficheiro com o teu trabalho no Classroom até ao dia 20/03/2026.

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