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Luas = 616 cm²
Dijawab ;
Luas = πr²
616 = 22/7 . r²
r² = 616 : 22/7
r² = 616 x 7/22
r² = 196
r = √196
r = 14 cm
Maka,
K = 2πr
= 2 . 22/7 . 14
= 88 cm
Jadi, jawabannya adalah D.
r kuadrat = 616 x 7/22
r kuadrat = 196
r = 14
v = 2 x 22/7 x 14
= 88 cm