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2826 = 1/4 . 3,14 . d²
2826 = 3,14/4 . d²
3,14/4 d² = 2826
d² = 2826 . 4/3,14 = 3600
d² = 3600² = 60dm
d2 :2826×4/3.14
:3600
lalu diakar sama dengan 60 dm