Pada segitiga ABC diketahui panjang ab = 7cm, bc=4cm dan sudut ABC 120°, tentukan panjang sisi ac? tolong teman teman penting banget ini:)
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Jawaban:
AC = 9,64 cm
Penjelasan dengan langkah-langkah:
AB =7 cm -> c =7 cm
BC=4 cm-> a = 4 cm
sudut ABC= 120° -> B = 120°
dit :
AC = ...? -> b= ...?
jawab;
aturan Cosinus
b² = a²+c²-2ac. cos B
b² = 4²+7²-2.4.7. cos 120°
b² = 16+49-56.(-1/2)
b²= 65+28
b²= 93
b =√93
b = 9,64 cm
jadi panjang AC = 9,64 cm