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sisi tanah = 30 m = 3000 cm
pjg sisi gambar = 3000 : 1000
= 3 cm
900 = s²
s = √900
s = 30 m ⇒ pnjang sisi sbenarnya
skala = gmbar/sebenarnya
1/1000 = s/3000
s = 3000/1000
s = 3 cm