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Luas permukaan = 78 4/7 cm²
Ditanya : d ?
Dijawab :
Luas permukaan = 4πr²
78 4/7 = 4 . 22/7 . r²
550/7 = 88/7r²
r² = 550/7 : 88/7
r² = 6,25
r = √6,25
= 2,5 cm
Maka,
d = 2r
= 2(2,5)
= 5 cm
Jadi, diameter bola adalah 5 cm.