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4 x 22/7 x r² = 2464
88/7 r² = 2464
r² = 2464 x 7 / 88
r² = 196
2464cm²=4.22/7.r²
2464cm²=88/7.r²
r²=2464cm² / 88/7
r²=2464cm² x 7/88
r²=196cm²
r=√196cm²
r=14cm
yeah !
smoga benar dan bermanfaat :)