nomo 25 yaaa itu coret²annya abaikan aja hehe

a/sina=b/sinb                         *a=BC,b=AC,c=AB.
<=>6/sin 90 = b/sin 30
<=>6/1 = b/1/2
<=>6 =2b
<=>b = 3 cm

c/sin c = d/sin d                  *c=AD,d=AC.
<=>c/sin 30 = 3/sin 60
<=>c/ 1/2 = 3/ 1/2√3
<=>1/2√3 c = 3/2
<=>c = 3/2 / 1/2√3
<=>c = 3/2 / 1/2√3 x √3/√3
<=>c= 3/2√3 / 3/2
<=>c= √3 cm

maaf kalau caranya agak ribet, semoga benar ya hehe