These following collection of
were written with Geometer's Sketchpad®. If you would
like to host the applets locally, please
contact Mike
May, S.J.

Applets
for Triangles in Geometry

Triangle Construction

The Basic Triangle Applet
constructs a triangle by dragging the three vertices to the desired
locations in the plane. The length of the sides and the measure
of the angles is computed.

The Triangle Side Length Applet
lets the user specify the length of the three sides, then constructs
the desired triangle.

Theorem Illustration

The Law of Sines Applet is designed
to illustrate the law of sines. The user drags three points to
define a triangle. The applet computes the length of the three
sides and the measure of the three angles. It then computes the
ratio of the length of each side to the values of the sine of the
opposite angle.

The Triangle Middle Applet
visualizes three theorems in geometry. For each theorem, you
define a method of cutting a triangle in half. (Use angle
bisector, or perpendicular bisector of a side, or line from vertex to
midpoint of opposite side.) Each theorem says the three dividing
lines all intersect in a single point. The applet lets you see
this on a triangle that can be distorted and stretched. It also
shows a related construction that is useful in the proof that the three
lines connect in a single point.

Applets
for Vectors

Vectors

The Adding
Vectors
Applet lets you
visualize two vectors with their sum and difference and the vectors
measured both in polar and rectangular coordinates.

The Projection, Dot and Cross
Product Applet lets you visualize the projection of one vector onto
another. It also gives a visualization of the dot and cross
product.

Applets
for Other Courses

The Trig Functions Applet connects the 6 standard trig functions with lengths of line segments from a diagram connected to the unit circle.