Prismas e Pirâmides
Os blocos retangulares (ou paralelepípedos) fazem parte de um grupo maior de poliedros: os prismas. Outro grupo importante de poliedros são as pirâmides. Alguns objetos que podem ser vistos no nosso dia a dia e que se assemelham com formas geométricas. Tais objetos se assemelham com os prismas e as pirâmides.
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PRISMAS
Alguns poliedros, pelas características que têm, são chamados de prismas. Veja a representação de alguns deles.
Na construção anterior, clique com o botão direito, segure e arraste para ver os prismas em diferentes posições. Quais são os polígonos que formam o prisma vermelho?
ELEMENTOS DO PRISMA
Todo prisma tem 2 bases paralelas e iguais e tem faces laterais retangulares.
![](data:image/png;base64,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)
Observe que o nome do prisma é definido de acordo com a forma das bases dele.
Um prisma de base hexagonal, possui:
PIRÂMIDES
Outros poliedros, pelas características deles, são chamadas de pirâmides. Veja a representação de algumas delas.
ELEMENTOS DA PIRÂMIDE
Toda pirâmide tem faces laterais triangulares.
Observe que o nome da pirâmide também é definido de acordo com a forma da base dela.
Uma pirâmide pentagonal possui?
Se uma pirâmide tem 7 vértices, quantos lados tem o polígono da base?