zbigniew63
Odp. Wzór na pole powierzchni całkowitej prostopadłościanu: Pc=2Pp+Pb. a) Pc=2*4[cm]*3[cm]+2*3[cm]*6[cm]+2*4[cm]*6[cm]=24+36+48=108[cm2]. b) Pc=2*7[dm]*7[dm]+4*7[dm]*4[dm]=98+140=238[dm2]. c) Pc=2*12[cm]*3[cm]+2*12[cm]*9[cm]+2*3[cm]*9[cm]=72+216+54=342[cm2]. d) Pc=2*40[dm]*2[dm]+2*40[dm]*8[dm]+2*2[dm]*8[dm]=160+640+32= 832[dm2].
b)7*7*5=245dm2
c)12*3*9=324cm2
d)40*2*8=640dm2
Wzór na pole powierzchni całkowitej prostopadłościanu:
Pc=2Pp+Pb.
a) Pc=2*4[cm]*3[cm]+2*3[cm]*6[cm]+2*4[cm]*6[cm]=24+36+48=108[cm2].
b) Pc=2*7[dm]*7[dm]+4*7[dm]*4[dm]=98+140=238[dm2].
c) Pc=2*12[cm]*3[cm]+2*12[cm]*9[cm]+2*3[cm]*9[cm]=72+216+54=342[cm2].
d) Pc=2*40[dm]*2[dm]+2*40[dm]*8[dm]+2*2[dm]*8[dm]=160+640+32= 832[dm2].
a=4cm
b=3cm
c=6cm
Pc=2ab+2bc+2ac
Pc=2*4cm*3cm+2*3cm*6cm+2*4cm*6cm=24cm2+36cm2+48cm2=108cm2 (cm2 oznacza centymetry kwadratowe)
zad.b
a=7dm
b=7dm
c=5d
Pc=2ab+2bc+2ac
Pc=2*7dm*7dm+2*7dm*5dm+2*7dm*5dm=98dm2+70dm2+70dm2=238dm2
zad.c
a=12cm
b=3cm
c=9cm
Pc=2ab+2bc+2ac
Pc=2*12cm*3cm+2*3cm*9cm+2*12cm*9cm=72cm2+54cm2+216cm2=342cm2
zad.d
a=4m=40dm
b=2dm
c=8dm
Pc=2ab+2bc+2ac
Pc=2*40dm*2dm+2*2dm*8dm+2*40dm*8dm=160dm2+32dm2+640dm2=832dm2