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x = 5 derajat
x+5y = 60 derajat (bertolak belakang)
5 + 5y = 60
5y = 55
y = 11 derajat
2. sudut PQR = sudut QRS = 30 derajat.
karena ada pelurus QRT maka sudut SRT :
180 derajat = 3x + 30 derajat
150 derajat = 3x
x = 50 derajat
3. A3 + A4 = 180 derajat ( karena berpelurus)
117 derajat + A4 = 180 derajat
A4 = 63 derajat
⇒A4 + C2 + B2 = jumlah sudut segitiga
63 + 32 + B2 = 180
B2 = 180 - 95 = 85