Cutting Polygons and Measuring Angles
the apps are optimized for use on computers and laptops rather than mobile devices and work best in the chrome browser.
This app allows you to create polygons, cut them, drag them, rotate them and recombine them. This is useful, for example, to teach the way to calculate the area of a parallelogram by turning it into a rectangle. The app also allows you to show and color the angles which can help teach the calculation of the sum of angles in a polygon. This is a very versatile app.