Odpowiedź:
a)
5 + 9 + 5 = 19cm
2 + 4 + 4 = 10cm
P= 10 × 19 = 190cm² = 190000mm²= 1,9dm²
b)
12+4+21= 37cm
12+12+4=28cm
P= 37 x 28 = 1036cm² = 1036000mm² = 10,36dm²
c)
5 + 3 +10= 18cm
4+3+4= 11cm
P= 11 x 18 = 198cm² = 198000mm² = 1,98dm²
