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Satu gelombang = 2 x 25 = 50 cm
3 gelombang = 3 x 50 = 150 cm
1 gelombang = 25 x 2 = 50 cm
berarti 1 gelombang = 50 cm
jika 3 gelombang = 50 x 3 = 150 cm
Jadi jawabannya = 150 cm
maaf kalau salah