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Papan Tulis : P
Meja : M
P : M = 8 : 4
4P = 8M
P + M = 4,5 cm
M = 4,5 cm - P
4P = 8 (4,5 - P)
4P = 36 - P
5P = 36
P = 7,2
M cari sendiri ya :D