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con circular drept
G=6 cm
At =27 pi cm2
Al =?


Răspuns :

At=πr(r+g) 
27π=πr(r +6)
r²+6r-27=0
(r+9)(r-3)=0
r=3
Al=πrg)=π×3 ×6)=18π= ≈56,52 cm²