Ex.4 7cm 2dm dau coroana

Ex4 7cm 2dm Dau Coroana class=

Răspuns :

Răspuns:

1 dm= 10cm,2dm=20cm

20cm-7cm=13cm

Raspunsul 6,5cm
P=2Ll
l=P-L:2
l=20cm-7cm:2=13cm:2=6,5cm