bisectors

A perpendicular bisector is a line that cuts (passes) through another line at right-angles (90°)

Construction is when you draw a geometric shape or diagram accurately. 

Often we only used a ruler and a compass, but sometimes we can use a protractor to draw accurate angles.

A perpendicular bisector can be constructed with a compass and a ruler.

An angle bisector is a line that cuts (passes) through an angle, creating two equal angles.

An angle bisector can be constructed with a compass and a ruler.