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72=18y
4=y
a=9.4=36
t=2.4=8
72 = 9y . 2y
72 = 18y²
4 = y²
2 = y
a = 9y
a = 9 . 2
a = 18 cm
t = 2y
t = 2 . 2
t = 4 cm