panjang bc =.... ....... cm

Mapel : Matematika
Kelas : X SMA
Bab : Trigonometri

Pembahasan :
Aturan Sinus

AC/Sin B = BC/Sin A
4/Sin 30° = BC/Sin 45°
4 . (1/2 √2) = 1/2 BC
2√2 = 1/2 BC
BC = 4√2 cm