Question

Oblicz pole powierzchni prostopadloscianu o wymiarach:
A)1m X 6m X 7m
b)4cm x 4cm x 7cm
c)11cm x 9 cm x 3cm
d03m x 1dm x 2m
Proszę o pomoc :) A i poczatek ma się zacząć tak:
Pc = 2x Pp + Pb

Answer 1

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

Answer 2

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