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1386= 22/7 X r2
Kita pakai 22/7 karena paling cocok.
1386 X 7/22= r2
441=r2
21=r
Luas Lingkaran = × r²
1.386 = × r²
r² = 1.386 ÷
= 1.386 ×
= 441
r =
= 21
Jadi Jari - Jari Lingkaran Tersebut Adalah 21