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2464 × 7 : 22 = r pangkat 2
784 = r pangkat 2
akar dari 784= r
28 = r
28 + 28= D
56 = D
2464 =22/7 × r²
r² = 2464 × 7/22
r² =784
r =√784
r =28
jadi diameternya adalah 2 × r = 28 × 2=56