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= 196 cm
Keliling 1/2 lingkaran = 1/2 x 22/7 x 14
= 22 cm
Keliling yang diarsir adalah 196 - 22 = 174 cm
a) 314 = 3,14 x d
d = 314/3,14
d = 100 cm
b) 1.400 = 3,14 x d
d = 445,45 cm
c) 200 = 3,14 x d
d = 200/3,14
d = 63,69 cm