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3.14 x x 28 = 22528
87,92 = 22528
= 256
r = 16
d = 32
22.528 =22/7×r²×28
22.528 =88r²
88r² =22.528
r² =22.528/88
r² =256
r =√256
r =16 cm
◆d=2×r
=2×16
=32 cm