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30.000 = 1/2 x 30 x n x 50
30.000 = 750 n
n = 40 cm

PYRTAGORAS 30, 40, ... 50

L = 2 x 1/2 x 30 x 40 + (30+40+50) x 50
= 1200 + 6000
= 7200 cm2