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Sześcian ma 12 krawędzi
A
a = 1 cm
S-suma długości krawędzi
S = 12*1 cm = 12 cm
B
a = 15 dm
S = 12*15 dm = 180 dm
C
a = 2 cm
S = 12*2 cm = 24 cm
ZAD.2
S = 156 cm
S/12 = a
a = 156/12
a = 13 cm
ZAD.3
A
a = 3 cm
b = 6 cm
c = 9 cm
S = 4a+4b+4c
S = 4*3+4*6+4*9
S = 12+24+36
S = 72 cm
B
a = 8 dm
b = 12 dm
c = 8 dm
S = 4a+4b+4c
S = 4*8+4*12+4*8
S = 32+48+32
S = 112 dm
C
a = 1 dm = 10 cm
b = 12 cm
c = 5 dm = 50 cm
S = 4a+4b+4c
S = 4*10+4*12+4*50
S = 40+48+200
S = 288 cm