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tinggi eskalotor sama dg tingggi segitiga
jadi dr pers sudut trigonometri
sin α = tinggi/sisi miring
sin 30 = 4/sisi miring
1/2 = 4 / sisi miring
sisi miring = 4 x 2 = 8
jadi sisi miring = panjang eskalator = 8 meter