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b derajat = 180-55
c derajat diperoleh dari sifat segitiga jumlah semua sudutnya 180 derajat
jadi c =180 - a derajat - 55
so, A+B+C, sangat mudah,,,
*115+a=180
a=180-115
a=65°
*55+b=180
b=180-55
b=125°
*a+55+c=180
65+55+c=180
120+c=180
c=180-120
c=60°
8.kamu ukur aja pake busur
3.6/14=9/9+x
54+6x=126
6x=126-54
6x=72
x=12
*AD = 12-9=3 cm
12/12+x=8/12
96+8x=144
8x=48
x=6
*KH = 6cm
x/8=15/10
x=120/10
x=12 cm
*PQ = 12 cm