Question

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Answer 1

Răspuns:

1. A= lxl  a) A= 7x7=49 $m^{2}$  b) A=27x27=729 $cm^{2}$  = 0,0729 $m^{2}$

c) A= 30x30=900 $dam^{2}$ = 9000 $m^{2}$

2. P=4*l  l= P:4 =156:4=39 m   latura=39 m

3. A=L*l  => l= A:L = 864:27=32m  

P=2l+2L= 2*32+2*27=64+54=118 m

4. P=4l => l= 400:4=100

A=100*100=10000 $m^{2}$

13*10000=130000 kg

130000* 4= 520000 lei

5. A=l*L= 5*8=40 $m^{2}$

40*64=2560 lei

6. P=2l+2L      l=L:2   => L=2l

P=2l+2*2l= 2l+4l= 6l

l= 354:6 =  59 m  

L= 2*59=118 m

A= L*l= 118*59= 6962 $m^{2}$

7. P1=4l => l=496:4 =124 m   latura patrat =124 m

A1= l*l= 124 *124= 15376 $m^{2}$ ( aria patrat)

34 876 - 15376 =19500 $m^{2}$ (aria dreptunghi)

A= l*L  => L=19500:130 =150 m

L=150m