Jawapan

2016-02-01T18:36:43+08:00
3x + 2x = 180
5x = 180
x = 180/5
x = 36

sudut peluaran
= 2x
= 2(36)
= 72

bilangan sisi poligon
= 360/ sudut peluaran
= 360/72
= 5 sisi