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A= π r2
r2= A/π
r= √A/π
r=√ 28 cm^2/π
r=√8,9 cm^2
r= 2,98 cm
》Encontramos la generatriz
g=√h^2 + r^2
g= √5^2 +2,98^2
g= √25+8,9
g=√33,9
g=5,82
R= La generatriz mide 5,82 cm