This is a collection of Geometer's SketchPad scripts that I find most useful.

**Trisection** - Trisect
a line segment, given the endpoints of the segment.

**Golden Ratio** -
Divide a line segment into two parts that form a golden ratio.

**Pedal Triangle**
- Construct the pedal triangle of a triangle, given the 3 vertices
of the original triangle and an extra point.

**Isosceles Triangle**
- Construct an isosceles triangle, given the endpoints of the
segment that is the base and the endpoints of the segment that
is the altitude.

**Sublime Isosceles Triangle**
- Construct a sublime isosceles triangle, given the endpoints
of one of the congruent sides.

**Excircle** - Construct
an excircle of a triangle, given the 3 vertices of the triangle
and an extra point on an extended side.

**Centroid** - Construct
the centroid of a triangle, given the 3 vertices of the triangle.

**Circumcenter** -
Construct the circumcenter of a triangle, given the 3 vertices
of the triangle.

**Circumcircle** -
Construct the circumcircle of a triangle, given the 3 vertices
of the triangle.

**Incenter** - Construct
the incenter of a triangle, given the 3 vertices of the triangle.

**Incircle** - Construct
the incircle of a triangle, given the 3 vertices of the triangle.

**Orthocenter** - Construct
the orthocenter of a triangle, given the 3 vertices of the triangle.

**Four Triangle Centers**
- Construct the centroid, circumcenter, incenter, and orthocenter
of the same triangle, given the 3 vertices of the triangle.

**Euler Line** - Construct
the Euler Line from the orthocenter to the circumcenter through
the centroid, given the 3 vertices of a triangle.

**Medial Triangle**
- Construct the medial triangle of a triangle, given the 3 vertices
of the original triangle.

**Orthocenter Mid-segment
Triangle** - Construct the triangle connecting the midpoints
of the segments from the vertices to the orthocenter, given the
3 vertices of the original triangle.

**Orthic Triangle**
- Construct the orthic triangle of a triangle, given the 3 vertices
of the original triangle.

**Center of the Nine Point
Circle** - Construct the center of the nine point circle
of a triangle, given the 3 vertices of the triangle.

**Nine Point Circle**
- Construct the nine point circle of a triangle, given the 3 vertices
of the triangle.

**Equilateral Triangle**
- Construct an equilateral triangle, given the endpoints of a
side.

**Square** - Construct
a square, given the endpoints of a side.

**Regular Pentagon**
- Construct a regular pentagon, given the enpoints of a side.

**Regular Pentagon**
- Construct a regular pentagon, given the endpoints of a radius.

**Regular Hexagon** -
Construct a regular hexagon, given the endpoints of a side.

**Regular Octagon** -
Construct a regular octagon, given the endpoints of a side.

**Regular Decagon** -
Construct a regular decagon, given the endpoints of a radius.

**Regular Dodecagon**
- Construct a regular dodecagon, given the endpoints of a side.

**Parabola** - Construct
a parabola, given the endpoints of its directrix and its focus.