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Keliling = 3,14 x 10
Keliling = 31,4 cm
Jadi, keliling lingkaran yang berdiameter 10 cm adalah 31,4 cm
Ok?
10 = 2r
10/2 = r
5 = r
maka :
k lingkaran = 2
= 2x3,14,5
= 31,4 cm