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1386 = 22/7 x r²
r² = 1386 : 22/7
r² = 1386 x 7/22
r² = 441
r = √441
r = 21 cm
dik r lingkaran kedua 1/3 lingkaran pertama
= 1/3 x 21
= 7 cm
Luas 2 = πr²
Luas 2 = 22/7 x 7 x 7
luas 2 = 154 cm²