Algodoo

The Prytz planimeter is a tool for measuring area. It is also called a Hatchet Planimeter.


Instructions:
1. Use the hand tool to move the orange dot horizontally out from the center to the edge of the area you wish to measure.
2. Drag the orange dot over the boundary of the area until you get back to where you started.
3. Drag the orange dot back to the center of the object.
4. The area of the object will be displayed in the box.

The area is computed internally by multiplying the distance between the orange and purple dots (2 meters) times the change in position of the purple dot.

Rev A: Added cross hairs to the orange dot.