kerja sebisanya aja..minimal 2 nomor..pke cara

30.AC=15-BC
BC/sin30=AC/sin90
BC/0,5=15-BC/1
BC=0,5(15-BC)
BC=7,5-0,5BC
BC+0,5BC=7,5
1,5BC=7,5
BC=7,5/1,5=5
AC=15-5=10
AB=akar 10^2 -5^2
AB=akar100-25
AB=akar75
AB=5akar3 cm(E)