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PRQ = 90
PQR = 180 - 90 - 20 = 70
ROQ = karen RO = OQ brrti segitiga sama kaki
maka ROQ = 180 - 70 - 70 = 40
2,
2x+ x + x + x = 125
5x = 125
x = 25
maka
AOB = 2x = 2(25) = 50