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[obm-l] trigonometria
- To: obm-l@xxxxxxxxxxxxxx
- Subject: [obm-l] trigonometria
- From: "Julio Sousa" <juliosousajr@xxxxxxxxx>
- Date: Mon, 26 Mar 2007 22:28:29 -0300
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1) Sendo A, B, C �ngulos internos de um tri�ngulo ret�ngulo, prove que:
senA + senB + senC = 4*cos(A/2)*cos(B/2)*cos(C/2)
2) Se num tri�ngulo ret�ngulo for satisfeita a igualdade cosB = senA/2*senC, existir� entre seus �ngulos a rela��o
a) B = A+C
b) B = 2C
c) C = 2B
d) C = A - B
e) B = C
--
Atenciosamente
J�lio Sousa