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Verified answer
(P4 dan Q4 adalah sudut dalam sepihak)2x + 40 + 20 = 180
2x = 120
x = 60 derajat
maka
P4 = 160 derajat
Q4 = 20 derajat
sudut yg lain
P1 = 180 - 160 = 20
P2 = P4 = 160
P3 = P1 = 20
Q4 = Q2 = 20 derajat
Q1 = Q3 = 180 - 20 = 160 derajat