Segitiga Siku-Siku | Segitiga Sembarang |
Dalil
Phitagoras 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 |
rumus perbandingan | perbandingan luas |
BC : DE = AB : AD = AC : AE |
(AB)(CE) = (BC)(AD) |
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