Question

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Answer 1

Răspuns:

Explicație pas cu pas:

4) L=4l

P=2L+2l

100=8l+2l

100=10l=>l=10

L=4l

L=4*10=40

A=L*l=40*10=400cm^2

5) a) A=8*8=64cm^2       P=8*4=32cm

    b) A=23cm*23cm=529cm^2       P=23cm*4=92cm

    c) A= 7cm*7cm=49cm^2          P=7cm*4=28cm

6) a)12cm=4l=> l=3cm => A= 3cm*3cm= 9cm^2

   b)50dam=4l=> l=12,5dam => A=12,5m*12,5m=156,25dam^2

   c)48dm=4l=> l=12dm => A=12dm*12dm= 144dm^2
7) a) 25cm^2=5^2cm=l^2 => l= 5=> P=4l=20cm

   b) 100cm^2=10^2cm=l^2=> l=10 => P= 4l= 40cm