construction
using a straightedge and a compass to draw a geometric figure
straightedge
a ruler with no markings on it
compass
a geometric tool used to draw circles and part of circles called arcs
perpendicular lines
two lines that intersect to form right angles
perpendicular bisector
a line, segment, or ray that is perpendicular to the segment at its midpoint
angle bisector
a ray that divides an angle into two congruent coplanar angles.