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L = 4 x x r²
= 4 x x r²
= x r²
r² = :
r² = x
r² =
r² = 6,25
r = √6,25
r = 2,5 cm
Panjang Diameter Bola
d = 2 x r
d = 2 x 2,5
d = 5 cm
Jadi, panjang diameter bola tersebut adalah 5 cm