Problem 1: First step: You see the
CIRCUMCENTERof a triangle ABC. If you move point C
along the line parallel to base AC... What locus of points
is created if C moves along the line parallel to the base.
Do a hand draft of this locus.

Problem 2: Now point C moves along a circle (or on
another curve). ......

Problem 3: Now we consider a quadrilateral
(4-sided polygon) ABCD. Construct the perpendicular
bisectors of the quadrilateral ABCD

Problem 4: You see CENTER
OF GRAVITY of a triangle ABC. If you
move point C along the line parallel to base AC... What
locus of points is created if C moves along the line
parallel to the base. Do a hand draft of this locus.

Problem 5: Now we consider a quadrilateral
(4-sided polygon) ABCD. Construct the perpendicular
bisectors of the quadrilateral ABCD