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62,8 = 2 . 3,14 . r
62,8 = 6,28r
r = 62,8 : 6,28
r = 10
Luas = 3,14 x 10 x 10
= 314
Luas juring = Luas lingkaran x 30/360
= 314 x 30/360
= 314 x 1/12
= 314/12
= 26,17
Itu jawabannya.