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3850 = 1/4 . 22/7 . d²
3850 = 22/28 . d²
d² = 3850 : 22/28
d² = 3850 x 28/22
d² = 4900
d = √4900
d = 70
Jadi, panjang diameter tersebut adalah 70 cm.
Itu jawabannya.
3850 = 22/7 * r²
26950 = 22 * r²
r² = 1225
r = 35 -----------> d = 2r = 70