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31,4 = 2 x 3,14 x r
31,4 = 6,28r
3140/628=r
5 = r
Luas lingakaran = Πr kuadrat
= 3,14 . 5. 5 = 78,5 cm2
31,4 = 2 x 3,14 x r
31,4 = 6,28 x r
r = 31, 4 : 6,28
r = 5
Luas =
L =3,14 x 5 x 5
L = 78,5 cm2