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4 x π x r² = 78 4/7
4 x 22/7 x r² = 550/7
88/7 x r² = 550/7
r² = 550/7 : 88/7
r² = 550/7 x 7/88
r² = 550/88
r² = 6,25
r = √6,25
r = 2,5
maka diamternya adalah
d = 2 x r
= 2 x 2,5
= 5 cm