# Amy's Script Library

### Assignment #5 for EMAT 6680, by Amy Hackenberg

On this page I am compiling a library of scripts that may be useful, especially when iterating constructions with The Geometer's Sketchpad, GSP. Try them out!

### Scripts for constructions dealing primarily with triangles (and circles).

• Orthocenter of a triangle. To use this script, start with three points on a GSP sketch. Make sure the three points are selected before you press "play" on the script.
• Centroid of a triangle. Start with three points on a GSP sketch.
• Circumcenter of a triangle. Also known as the construction for a circle that passes through a given three points. The circle is called the circumcircle of the triangle. Start with three points on a GSP sketch.
• Incenter of a triangle. Also known as the construction for a circle that is tangent to three sides of a triangle. The circle is called the incircle of the triangle. Start with three points on a GSP sketch.
• Excircles of a triangle. Start with three points on a GSP sketch.
• Nine-Point Circle for a triangle. This construction will produce the diagram I used in Write Up #4.
• Euler Line of a triangle. Start with three points on a GSP sketch.
• Pedal Triangle. Start with three vertices of a triangle and any point in the plane of the triangle.

### Scripts for constructions dealing with circles.

• Tangent Circle 1--construction of a circle tangent to two given circles such that it contains neither. Start with four points on a GSP sketch.
• Tangent Circle 2--construction of a circle tangent to two given circles such that it contains one of the circles. Start with four points on a GSP sketch.