Texto sobre Ângulos  - 8º ano A (Para responder a ficha, após leitura do texto)
Autor: Diego da Silva Nantes | Publicado: 2014-03-23T12:00:00-07:00


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Ângulos
Denominamos ângulo a região do plano limitada
por duas semi-retas de mesma origem. As semi-retas recebem o nome de lados do
ângulo e a origem delas, de vértice do ângulo.




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<![endif]-->A unidade usual de medida
de ângulo, de acordo com o sistema internacional de medidas, é o grau,
representado pelo símbolo º, e seus submúltiplos são o minuto ’ e o segundo ”.
Temos que 1º (grau) equivale a 60’ (minutos) e 1’ equivale a 60”(segundos).

O objeto capaz de medir o valor de um ângulo é chamado de transferidor, podendo
ele ser de “meia volta” (180º) ou volta inteira (360º).
















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<![endif]-->Classificação de ângulos&nbsp;

Os ângulos são classificados de acordo com suas medidas:

Agudo: ângulo com medida menor que 90º.
Reto: ângulo com medida igual a 90º.
Obtuso: ângulo com medida maior que 90º.
Raso: ângulo com medida igual a 0º ou 180º.




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<![endif]-->Bissetriz de um ângulo

Bissetriz de um ângulo pode ser definida como a semi-reta que se origina no
vértice do ângulo principal, dividindo-o em outros dois ângulos com medidas
iguais.




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<![endif]-->Retas paralelas cortadas por uma transversal&nbsp;








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Ângulos
correspondentes:&nbsp;a&nbsp;e&nbsp;e,&nbsp;d&nbsp;e&nbsp;h,&nbsp;b&nbsp;e&nbsp;f,&nbsp;c&nbsp;e&nbsp;g&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;Congruentes
Ângulos colaterais externos:&nbsp;a&nbsp;e&nbsp;h,&nbsp;b&nbsp;e&nbsp;g&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Suplementares
Ângulos colaterais internos:&nbsp;e&nbsp;e&nbsp;d,&nbsp;c&nbsp;e&nbsp;f&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Suplementares
Ângulos alternos externos:&nbsp;a&nbsp;e&nbsp;g,&nbsp;b&nbsp;e&nbsp;h&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Congruentes
Ângulos alternos internos:&nbsp;d&nbsp;e&nbsp;f,&nbsp;c&nbsp;e&nbsp;e&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Congruentes