Răspunsuri

2014-08-05T15:31:01+03:00
A)ABCD-dreptunghi

ΔABC, mas<B=90
BC²=AC²-AB²=5²- 4²=25-16=9  =>BC=3m

b)A=L*l=3*5=15m²

c)15*480= 7200 lei costa covorul
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2014-08-05T15:31:57+03:00
A)d=5m
L=4m

l ²= d²-L²
l²=5²-4²
l²=25-16
l²=9
l=√9 , ⇒ l = 3 m . 

b)A = L*l
A= 4*3
A=12m²

c) 1m².....480 lei 
12m²...x lei 
x = 12*480
x = 5760 lei . 
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