ESFERAS - PARTE I
Autor: Professor Valadares | Publicado: 2010-02-21T18:08:00-08:00



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 ESFERA A superfície esférica é a superfície gerada pela rotação de uma semicircunferência em torno de um eixo que contém seu diâmetro.
Área da A de uma superfície esférica de raio R é dada por:A = 4 π r2



&nbsp;
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  A esfera é o sólido de revolução gerado pela rotação de um semicírculo em torno de um eixo que contém o diâmetro. 
O volume V de uma esfera de raio R é dado por:V = 4/3 π r3



ELEMENTOS DE UMA ESFERA &nbsp;
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  A nomenclatura seguinte deve-se ao fato de a Terra ser considerada aproximadamente uma esfera.Pólos (P1 e P2): são as interseções da superfície com o eixo (e)
Equador: é seção (circunferência) perpendicular ao eixo, pelo centro da superfície 
Paralelo: é uma seção (circunferência) perpendicular ao eixo. É “paralela” ao equador.
Meridiano: é uma seção (circunferência) cujo plano passa pelo eixo

SEÇÃO DA ESFERA 

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  A intersecção de um plano com uma esfera é um círculo.
r2 = d2 + s2

&nbsp;
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  Se o plano secante passa pelo centro da esfera, temos como seção um círculo máximo da esfera.&nbsp;
Professor Valadares Bom raciocínio Abração&nbsp;