This activity can be done in groups or individually.
If done in groups, have EACH student prepare a graph.
The group is for sharing supplies.
Each student copies a different
sample graph onto graph paper.
Cut the graph paper so that one of
the endpoints is on the edge of the graph paper.
Find the slope of the segment.
Fold the graph paper so that the
endpoints of the segment meets.
Unfold the graph paper. Trace
the folded line. Find its slope.
Measure the angle between the
original segment and the folded line.
Record the group's findings to show
the slope of each segment and the slope of its fold line.
Make a conjecture
about the slopes of perpendicular lines.