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644,24 = 12,56 . r2
644,24/12,56 = r2
51,29 = r2
= r
7.1 = r
gua sederhanain jadi 7, jadi d = 2 . r = 2 . 7 = 14 cm
644,24 = 4 x 3,14 r²
r² = 644,24/3,14x4
r²= 644,24/12,56
r² = 51
r = √51
d=2r
d= 2√51