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tinggi pohon = a+4
bayangan pohon = 6,3 m
bayangan anak= 1,8 m
dibandingkan aja,
tinggi anak / bayangan anak = tinggi pohon / bayangan pohon
a / 1,8 = (a+4) / 6,3 m
kali silang,
6,3a = 1,8a + 7,2
6,3a-1,8a = 7,2
4,5a = 7,2
a = 7,2/4,5
a = 1,6m
tinggi pohon = a+4
= 1,6m + 4m
5,6m