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12,56=α:360×π×d
12,56=α:360×3,14×20
12,56=α:360×62,8
α=12,56×360
62,8
α=72 derajat
12,56 = πd x a/360
12,56 = 3,14 . 20 x a/360
12,56 = 62,8 x a/360
12,56 = 62,8a/360
12,56 x 360 = 62,8a
4521,6 = 62,8a
a = 4521,6/62,8
a = 72°
Jadi, sudut pusatnya adalah 72°.