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kita cari sudut C dulu menggunakan aturan sinus
AC/sin sudutB = AB/sin sudut C
6/sin90 = 3 / sin sudutC
sin sudut C = 3 / 6
sin sudut C = 1/2
sudut C= 45
sudutnya 45, berarti AB = BC =3
L= 1/2 x AB x BC
L= 9