2L=158-(47+7)=104 H=52*3/2=78 (B-b)/2=47-7=40/2=20 h(trap.)=V 52^2-20^2=48
Sb=(47+7)*48/2=1296 V=1296*78=101088cm3
https://www.sosmatematica.it/forum/domande/help-pls/#post-105822
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