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Verified answer
L.lingkaran = 1386 cm²πr² = 1386
22/7 x r² = 1386
r² = (1386 x 7) / 22
r² = 9702/22
r = √441
r = 21 cm
jari2 =r
maka r²=L : 2π
=1386 : 22/7 x 2
=1386 : 44/14
= 1386 x 14 /44
=441
r=√441
r= 21 cm
jadi jari2 nya = 21 cm