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Gabrielpavlovschi
a fost răspuns

dau 40 puncte si coronita

Dau 40 Puncte Si Coronita class=

Răspuns :

Letitiasqn
1)
P=30=2(L+l)=>L+l=15
l+L=15
L/3=l/2=(l+L)/5=15/5=3
L=3×3=9 l=2×3=6
A=L×l=9×6=54(m^2)

2)
Fie a si b cele 2 unghiuri.
a+b=90°
(4/9) ×a=2× (2/3) ×b=> 4a/9=4b/3=>4a/3=4b=>4a=12b=>a=3b

3b+b=90°=>4b=90°=>b=22,5°=22° 30'
a=90,00°-22,50°= 67,50°=67° 30'
4)P=30m
   a=x/2; b=x/3
x/2+x/3=15
5x=90
x=18
deci a=9m, b=6m
P=a*b=54m²


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