aturan cosinustrigonometrib² = a² + c² - 2ac cos ∠B
Penjelasan dengan langkah-langkah:
Δ ABC , a = 10 cm, c = 12 cm , ∠B= 45
b² = a² + c² - 2ac cos ∠Bb² =10² + 12² - 2.10. 12 cos 45°b² =100 + 144 - 240 . b² = 244 - 120 √2b² = 4(61 - 30√2)
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aturan cosinus
trigonometri
b² = a² + c² - 2ac cos ∠B
Penjelasan dengan langkah-langkah:
Δ ABC ,
a = 10 cm, c = 12 cm , ∠B= 45
b² = a² + c² - 2ac cos ∠B
b² =10² + 12² - 2.10. 12 cos 45°
b² =100 + 144 - 240 .
b² = 244 - 120 √2
b² = 4(61 - 30√2)