Question

Un teren dreptunghiular are perimetrul de 480m.Stiind ca lungimea este de 135m calculati aria terenului in m² si exprimati-o apoi in ari

Answer 1

P=480 m
L=135 m
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Aria=? m² , ari.
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P=2*(L+l)
P=2L+2l
2l=P-2L
$\boxed{l= \frac{P-2L}{2}}$
$l= \frac{480-2*135}{2} = \frac{480-270}{2}= \frac{210}{2}=105 ~m$

Aria=L*l
Aria=135*105
Aria=14175 m²
Aria=141,75 ari.