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tan 45 = h/x
Dengan:
h = Tinggi pohon
x = Jarak horizontal
1 = h/x
h = x
Ternyata tinggi pohon di atas Alvi sama dengan jarak horizontalnya, yakni 2 meter
Ditambah dia ada di ketinggian 18 meter
Tinggi pohon = 18 + 2 = 20 meter