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t2 = tinggi anak
b1 = bayangan pohon = 6,3 m
b2 = banyangan anak = 1,8 m
..
t2/t1 = b2/b1
b1(t2) = b2(t1)
6,3 (t2) = 1,8(4+t2)
(6,3 - 1,8) t2 = 1,8 (4)
4,5 t2 = 7,2
t2 = 7,2 : 4,5 = 1,6 m
tinggi pohon = 4 +t2 = 4 + 1,6 = 5,6meter