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p. byangan pohon = 8m
t.pohon = 20
t. listrik = ?
byangan pohon/t.pohon = byangan listrik/ t.listrik
=8m/20 = 5/x (kali silang)
= 8x = 20 x 5
= 8x = 100
x = 100/8 = 12,5
jadi tinggi tiang listrik adalah 12,5
20x=40 selanjutnya
x=2 jadi tinggi tiang listrik sama dengan 2 m