Free web-based resource from visnos to explore the properties of polygons. Use sliders to change the number of sides producing the regular polygons. Show different angles including interior and exterior. The vertices can be dragged for irregular shapes. A protractor can be displayed to demonstrate measuring angles. A ruler can be shown for measuring the sides. Colors and styles can be changed. This activity at its most basic can be used in lower grades for identifying shapes; area and perimeter problems.But advanced features make it useful for high school and beyond.
Interactive Polygon Explorer
Great tool to show shapes, angles, measurement and more. Useful for many grade levels.