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b)7dm,7dm,5dm = 238dm2
c)12cm,3cm,9cm = 342cm2
d)4m,2dm,8dm = 112dm2
6cm * 3cm = 18cm * 2 poniewaz sa 2 boki
6cm * 4 cm = 24cm *2 poniewaz sa 2 boki
24cm*2 + 18cm*2 +12cm*2 cm =108cm kwadratowych
b)7dm*5dm=35dm * 4
7dm * 7dm = 49dm * 2
49dm*2+35dm*4= 238dm kwadratowych
c)12cm*3cm=36cm *2
12cm*9cm=108cm *2
3cm*9cm=27cm *2
27cm*2+108cm*2+36cm*2=342cm kwadratowych
d)40dm*2dm=80dm*2
40dm*8dm=320dm*2
8dm*2dm=16dm*2
16dm*2+320dm*2+80dm*2=832dm kwadratowych