1. Oblicz pole powierzchni prostopadłościanu o wymiarach:
a). 4cm, 3 cm, 6 cm c). 12 cm, 3 cm, 9 cm
b). 7 dm, 7 dm, 5dm d). 4 m, 2 dm, 8 dm
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oblicz pole powierzchni prostopadloscianu o wymiarach:
a)4cm,3cm,6cm.
Pc=2(4*3)+2(4*6)+2(3*6)
Pc=24+48+36
Pc=108 cm²
b)7dm,7dm,5dm.
Pc=2(7*7)+4(7*5)
Pc=98+140
Pc=238 dm²
c)12cm,3cm,9cm.
Pc=2(12*3)+2(12*9)+2(3*9)
Pc=72+216+54
Pc=342 cm²
d)4m,2dm,8dm.
Pc=2(4*2)+2(4*8)+2(2*8)
Pc=16+64+32
Pc=112 dm²
a). Pc = 2•a•b+2•b•c+2•a•c
a = 4 cm
b = 3 cm
c = 6 cm
Pc = 2•4cm•3cm+2•3cm•6cm+2•4cm•6cm = 24cm+36cm+48cm = 108cm2
b) Pc = 2•a•b+2•b•c+2•a•c
a= 7 dm
b= 7 dm
c= 5cm
Pc = 2•7dm•7dm+2•7dm•5dm+2•7dm•5dm = 98dm + 70dm + 70dm = 238cm2
c) Pc = 2•a•b+2•b•c+2•a•c
a= 12cm
b= 3cm
c= 9cm
Pc = 2•12cm•3cm+2•3cm•9cm+2•12cm•9cm = 72cm + 54cm + 216cm =342cm2
d) Pc = 2•a•b+2•b•c+2•a•c
a= 4m = 40dm
b= 2dm
c= 8dm
Pc = 2•40dm•2dm+2•2dm•8dm+2•40dm•8dm =160dm + 32dm + 640 dm = 832cm2