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Intr un dreptunghi L=3l . P=32cm . Aflati diagonala

Răspuns :

P=2L+2l
P=6l+2l
8l=32 =>l=4 =>L=12
d^2 = L^2 + l^2
d^2 = 144+16
d^2=160 =>d=4rad10
P = 32 = 2L + 2l si L = 3l

32 = 6l + 2l

32 = 8l

l = 4 cm

L = 12 cm

d² = L²  + l²

d = √(144 + 16)

d = √160

d = √16·10

d = 4√10 cm