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Luas = 314 . 4
Luas = 1256
Rumus luas lingkaran :
1256 = 3,14 .
1256 / 3,14 =
400 =
= r
20 = r
Diameter adalah 2 kali dari panjang r. Maka,
D = 2 . r = 2 . 20 = 40cm