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pb=pohon bayangan
ts=5m
tb=8m
pb=20m
ps=?
ts\tb=ps\pb
5\8=ps\20
ps=20×5\8
ps=12,5m
x/5 = 20/8
8x = 20 x 5
8x = 100
x = 100/8
x = 12,5 m
semoga membantu ^^