2)
l=4dm
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A patrat=?
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A pătrat = l²=4²=16dm²
4)
A dreptunghi=32m²
L=2l
___________________
P dreptunghi =?
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A dreptunghi= L•l
L=2l
➜A dreptunghi = 2l•l=2l²
A dreptunghi = 32m²
➜2l²=32
l²=32:2
l²=16
l=✓16
l=4m
L=2l
l=4m
➜L=2•4=8m
P dreptunghi = 2l+2L= 2•4 + 2•8 = 8+16 = 24m
