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1386 = 22/7 . r²
1386 x 7/22 = r²
441 = r²
√441 = 21
21 = r²
jadi jari-jari lingkaran 21 cm
phi X r X r = 1386
22/7 X r X r = 1386
22 X r X r = 198
r X r = 9
r = akar dari 9
r = 3