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jarak kepala siswa ke ujung tiang = 130 cm
terbentuk segitiga siku-siku
50² + x² = 130²
2500 + x² = 16900
x² = 16900-2500
x² = 14400
x = √14400= 120 cm
tinggi anak = 250 - 120 = 130 cm (D)