a) 2*(1*6)+2*(6*7)+2*(1*7)=12+84+14=110cm2 b) 2*(4*4)+2*(4*7)+2*(4*7)=32+56+48=136cm2 c) 2*(11*9)+2*(9*3)+2*(11*3)=198+54+66=318cm2 d) 3m = 300cm 1dm = 10cm 2m = 200cm 2*(300*10)+2*(10*200)+2*(200*300)=6000+4000+100000=1100000
A)1m X 6m X 7m Pc = 2*Pp + Pb Pp = 1 m * 6m Pp= 6m² Pb = 2 * P₁ + 2* P₂ P₁ = 1 m * 7m P₁ = 7m² P₂ = 6m * 7m P₂ = 42m² Pb = 2 * 7m² + 2*42m² Pb = 14 + 84 Pb = 98 m² Pc = 2* 6m² + 98m² Pc = 12 + 98 Pc = 110 m² b)4cm x 4cm x 7cm Pc = 2* Pp + Pb Pp = 4 cm *4cm Pp = 16 cm² Pb = 4 * P₁ P₁ = 4 cm * 7 cm P₁ = 28 cm² Pb = 4 * 28 Pb = 112 cm² Pc = 2 * Pp + Pb Pc = 2 * 16 + 112 Pc = 32 + 112 Pc = 144 cm² c)11cm x 9 cm x 3cm Pc = 2* Pp + Pb Pp = 11 * 3 Pp = 33 Pb = 2 * P₁ + 2* P₂ P₁ = 11 * 9 P₁ = 99 P₂ = 9 * 3 p₂ = 27 Pb = 2 * 99 +2*27 Pb = 198 + 54 Pb = 252 Pc = 2 * 33 + 252 Pc = 66 + 252 Pc = 318 cm² d03m x 1dm x 2m Pc = 2* Pp + Pb Pb = 2 * P₁ + 2* P₂ 1 dm = 0,1m Pp = 3 m * 0,1m Pp = 0,3 m² P₁ = 3 * 2 P₁ = 6m² P₂ = 0,1 * 2 P₂ = 0,2 m² Pb = 2*6 + 2*0,2 Pb = 12 + 0,4 Pb = 12,4 m² Pp = 2*0,3 + 12,4 Pp = 0,6 + 12,4 Pp = 13m²
