Question

DAU COROANA!!!Un paralelipiped dreptunghic ABDCA'B'C'D' ARE AB=3cm,BC=4 cm si diagonala AC'=13 cm.Calculati:
a)inaltimea paralelipipedului;
b)aria toatala a paraleelipipedului;
c)volumul paralelipipedului.

Answer 1

a)AC'²=AB²+BC²+AA'² AA'²=AC'²-AB²-BC² AA'²=169-9-16=144=>AA'=√144=12 cm b)At=Al+2Ab Al=4• BC•AA'=4•4•12=192 cm² Ab=AB•BC=3•4=12 cm² At=192+2•12=216 cm² c) V=Ab•h=12•12=144 cm³