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Jawab
r = 100 cm
pi = 3,14
Pb = 31,4
Pb = a/360 x keliling ling
31,4 = a/360 x 2 pi r
31,4 = a/360 x 2 x 3,14 x 100
10 = a/360 x 200
a/360 = 10/200 = 1/20
a = 360/20
a = 18
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