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L = 1386 cm^2
π = 22/7
L = πr²
1386 = 22/7 x r²
r² = 1386 :22/7
r² = 1386 x 7/22
r² = 441
r =√441
r = 21 cm
d = r x 2
d = 21x2
= 42 cm
K = πd
= 22/7 x 42
= 132 cm
= 1.386 = 22/7.r²
= r²= 1.386.22/7 = 63.7 = 441 jadi jawabannya adalah r = 21 cm