Question

aria totala a unui paralelipiped dreptunghic cu dimensiunile de 4 cm, 3 cm si 6 cm este egala cu....

Answer 1

(6x3)x2=18x2=36 cm
(6x4)x2=24*2=48 cm
(3x4)x2=12x2=24 cm

Aria totala=36+48+24=108 cm².

$Sper$ $ca$ $te-am$ $ajutat!$

Answer 2

$L=6 \ cm \\ l=4 \ cm \\ h=3 \ cm \\ \\ A_t=A_l+2A_b \\ A_l=2(L\cdot h+l \cdot h) \\ A_b=L \cdot l \\ \Rightarrow A_l=2(6 \ cm \cdot 3 \ cm+4 \ cm \cdot3 \ cm) \\ \Rightarrow A_l=2(18 \ cm+12 \ cm) =2 \cdot 30 \ cm \\ \Rightarrow A_l=60 \ cm^2 \\ \Rightarrow A_b=6 \ cm \cdot 4 \ cm \\ \Rightarrow A_b=24 \ cm^2 \\ A_t=60 \ cm^2+2 \cdot 24 \ cm^2 \\ A_t=60 \ cm^2+48 \ cm^2 \\ \Rightarrow \boxed{A_t=108 \ cm^2}.$