Geo-Calc is a geometry calculator. Use it to work out all the measurements (area, perimeter, sides, angles, etc) of 2D and 3D shapes.

Used by teachers, students, educational institutions, engineers, architects, carpenters, rocket scientists and mathematicians…

3-2-1 displays hours, minutes, and seconds, includes a lap function and is resizable.

You can label each countdown (useful if you run more than one timer at a time), enter your own messages (to appear when a countdown has finished) and choose any sound to play.