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dit : r = ... cm
jawab :
L = π x r2
1386 = 22/7 x r2
r2 = 1386 : 22/7
r2 = 441
r = 21
jadi jari-jari lingkaran adalah 21 cm
d2; r ...?
d3; L lngkran ; phi r2= 22/7 x 21x21 = 1386
jdi..r /jari2 = 21 cm