Odpowiedź:
a)
mm
3cm² = 3 * cm² = 3 * cm * cm = 3 * 10mm * 10mm = 300mm²
7cm² = 7 * cm * cm = 7 * 10mm * 10mm = 700mm²
12cm² = 12 cm * cm = 12 * 10 mm * 10 mm = 1200mm²
b)
cm²
5dm² = 5 * dm * dm = 5 * 10cm * 10cm = 500cm²
8dm² = 8 * dm * dm = 8 * 10cm * 10cm = 800cm²
21dm² = 21 * dm * dm = 21 * 10cm * 10cm = 2100cm²
c)
mm²
4dm² = 4 * 100mm * 100mm = 40000mm²
6dm² = 6 * dm * dm = 6 * 100mm * 100mm = 40000mm²
11dm² = 11 * dm * dm = 11 * 100mm * 100mm = 110000mm²
Szczegółowe wyjaśnienie:
