Let

be a fixed point on the circle. For a variable point

on the circle, construct the point

so that angle

angle

Find the locus of the line segment

as

varies over the circle.

Let

be a fixed point on the circle. For a variable point

on the circle, construct the point

so that angle

angle

Find the locus of the line segment

as

varies over the circle.

Let

be a fixed point on the circle. For a variable point

on the circle, construct the point

so that angle

angle

Find the locus of the straight line

as

varies over the circle.

Let

be a fixed point on the circle. For a variable point

on the circle, construct the point

so that angle

angle

Find the locus of the straight line

as

varies over the circle.

Let

be a fixed point on the circle

.
For a variable point

on the circle, construct the circle with center

passing through

Find the locus of the circle

as

varies over the circumference of circle



Let

be a fixed point on the circle

.
For a variable point

on the circle, construct the circle with center

tangent to the straight line

Find the locus of the circle

as

varies over the circumference of circle



Let

be the orthogonal projections of a variable point

on the circle upon two fixed mutually perpendicular diameters. Find the locus
of the line segment

as

varies over the circle.

As in the above construction, find the locus of the foot of perpendicular
dropped from

upon

as

varies over the circle.

Let

be a fixed point inside the circle. Construct the perpendicular bisector of

where

is a variable point on the circle. Find the locus of this perpendicular
bisector as

varies over the circle.

What happend as

is moved outside the circle?

Construct the parabola as an envelope of straight lines.

Show that the feet of perpendicular from any point on the circumcircle of a
triangle upon the sides of the triangle lie on a straight line. This line is
called the Simson line. It is also called the Wallace
line. Find the locus of all possible Simson lines to a fixed
triangle.
