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= 2.sudut ABC
= 2.55˚
= 110˚
sudut AEC = sudut keliling = sudut ABC = 55˚
2) sudut PSQ = sudut PRQ
= sudut keliling
= 1/2.sudut PTQ
= 1/2.160˚
= 80˚
3) a = 2.70˚ = 140˚
b = 1/2.120˚ = 60˚