tlg dijawab y..makasih

n = 360°/x - 1
9 = 360°/x - 1
10 = 360°/x
x = 36° ← jwb

n = 9 bayangan
a = ?

a  = 360°/ (n + 1)
a = 360°/ (9 + 1)
a = 360°/10
a = 36°