Geometry · Points, Lines & Angles
Angle Bisector
HSG-CO.A.1
Definition
A ray that divides an angle into two congruent (equal) angles.
Examples
- An angle bisector splits an 80 degree angle into two 40 degree angles.
- An angle bisector of a 60 degree angle creates two 30 degree angles.
Key rule
An angle bisector always creates two congruent angles.
Memory hook
Cuts an angle exactly in half.