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1.386 = 22/7 x jari" x jari"
jari" x jari" = 1.386 ÷ 22/7
jari" x jari" = 1.386 x 7/22
= 441
jari" = √441
= 21 cm
1386= 22/7×r²
1386×7/22=r²
√441=r
21=r