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154 = π x r²
154 = 22/7 x r²
22r² = 154 x 7
22r² = 1,078
r² = 1,078 ÷ 22
r² = 49
r = √49
r = 7 Cm
Diameter = 7 x 2 = 14 Cm
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[DAMNATION]™
154 : 22/7 x r x r
154 :22/7 r2
154 x 7/22
49: r2
49
jadi diameternya 49
maaf kalau salah