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ex 7 si 8 repede ...​

Ex 7 Si 8 Repede class=

Răspuns :

Răspuns:

7) P=2(L+l)

P=12dm

AB=L=4dm

AD=l=?

12=2(4+l)

12:2-4=l=>AD=2dm

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8) P=24cm

AB=2CD=>L=2l=>L=2·4=>AB=8cm

24=2(2l+l)

24:2=3l=>l=12:3=>CD=4cm