Wednesday, November 26, 2008

Dalil Protagoras's & Dalil Cos

Dalil Protagoras's
c² = a² + b²
sin a = a/c
cos a = b/c
tg a = a/b
luas = 1/2 ab

Dalil Cos

c² = a² + b² - 2ab cos
luas = 1/2 a.b sin

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