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1.100 = 22/7 x r² x 14
r² = 1.100 x 7/22 / 14
r² = 50 x 7 /14
r² ²= 50/2
r² = 25
r = 5
1100 :22/7 x r² x14(dicoret yang 7 dengan 14 nya)
1100 :44 x r²
r² :1100 ÷ 44
r :√25 =5 cm