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maka kita substitusikan ke persamaan sebagai berikut
2 × 3,14 × r = 163,28
3,14 × r = 81,64
r = 26
karena diameter = 2 × r
maka diameter = 2 × 26 = 52 cm
Diameter lingkaran = 52 cm
= 163,28 : 3,14
=52 cm