Răspuns:
Explicație pas cu pas:
a=12, b=24. V=6048
V=a·b·c, deci 12·24·c=6048, ⇒c=6048:288=21cm
d²=a²+b²+c²=12²+24²+21²=3²·(4²+8²+7²)=3²·(16+64+49)=3²·129. Deci d=3√129 cm.
A(l)=P(b)·c=2·(a+b)·c=2·(12+24)·21=72·21=1512cm².
A(t)=A(l)+2·A(b)=1512+2·a·b=1512+2·12·24=1512+576=2088cm²
