Question

Dau coroana
Un paralelipiped dreptunghic are dimensiunile 18 cm,2dm,0,24 m.Calculati:
a)Aria totala a paralelipipedului
b_volumul paralelipipedului
c)lungimea diagonalei paralelipipedului

Answer 1

2 dm=20 cm
0,24 m= 24 cm
Atotala=2(18x20+18x24+20x24)=2(360+432+480)=2*1272=2544 cm²
V=18x20x24=8640 cm³
diagonala =√(18²+20²+24²)=√(324+400+576)=√1300=10√13 cm

Answer 2

$2~dm=20~cm \\ 0,24~m=24~cm \\ A _{totala}=2*(18*20+18*24+20*24) \\ =2*(360+432+480) \\ =2*1272=2544~cm ^{2} \\ V=18*20*24=8640~cm ^{3} \\ Diagonala= \sqrt{( 18^{2} }+ 20^{2} + 24^{2}) \\ = \sqrt{(324+400+576)} = \\ = \sqrt{1300}=10 \sqrt{13} ~cm$