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Bab Garis dan Sudut
Δ PQR adalah segitiga sama kaki
PQ = QR, maka sudut P = sudut R
Sudut P + sudut Q + sudut R = 180°
Sudut P + 112° + sudut P = 180°
2 . sudut P = 180° - 112°
Sudut P = 68°/2
Sudut P = 34°