Sudut a 60 derajat b 75 derajat panjang ab 12 cm berapakah panjang bc?

Kelas 10 Matematika
Bab Trigonometri

Sudut C
= 180° - sudut A - sudut B
= 180° - 60° - 75°
= 45°

bc/sin A = ab/sin C
bc = 12 . sin 60° / sin 45°
bc = 12 . (1/2 √3) / (1/2 √2)
bc = (12 √3)/(√2) . (√2)/(√2)
bc = (12 √6)/2
bc = 6 √6 cm