Angle bisector of straight angle also act as bisector of the rays making straight angle.

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Angle bisector of straight angle also act as perpendicular bisector of that angle.

Angle bisector of straight angle (i.e $180^{0}$ ) divides it into two right angles. So, that bisector is perpendicular to both the rays making straight angle as shown.

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Angle bisector of straight angle also act as bisector of the rays making straight angle.

Angle bisector of straight angle also act as perpendicular bisector of that angle. Angle bisector of straight angle (i.e 1800) divides it into two right angles. So, that bisector is perpendicular to both the rays making straight angle as shown.

Angle bisector of straight angle also act as perpendicular bisector of that angle.

Angle bisector of straight angle (i.e $180^{0}$ ) divides it into two right angles. So, that bisector is perpendicular to both the rays making straight angle as shown.