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616=4 x 22/7 x r^
r^=49
r=7 CM
4 × 22/7 × r² = 616
88/7 × r² = 616
r² = 616 / (88/7)
r² = 616 × 7/88
r² = 7 × 7 ( 616 dan 88 di sederhanakan -> 616/88 = 7 ; 88/88 =1)
r²=49
r=√49
r=7 m