tolong dong,, pakai cara ya

cari db dulu
db/sin 45 = ad/sin 30
db/(√2/2) = 2/(1/2)
db / (√2/2) = 4
db = 4 × (√2/2)
db = 2√2

db/sin c = bc/sin 60
2√2 / sin c = 4/(√3/2)
4.sin c = 2√2 × √3/2
4.sin c = √6
sin c = √6/4
sin c = (1/4)√6