The last tutorial demonstrated how to draw a four sided regular polygon, the square. What we learned about calculating the turtle's turning angle in that tutorial will hold for other regular polygons as well.

For any regular polygon:

- The turtle turns a total of 360 degrees as it moves around the perimeter.
- There are as many vertices as sides.
- All the vertices have equal turtle turning angles.
- The turning angle is calculated by taking 360 degrees and dividing it by the number of sides (or number of vertices).

In general:

(turtle's turning angle) = (360 degrees) / (number of sides)

Triangle, 3 sided:

(120 degrees) = (360 degrees) / (3)

Pentagon, 5 sided:

(72 degrees) = (360 degrees) / (5)

And so on....

This is another classic type of EZ Math Movie. It is an animation that will continuously clear the graph and draw a regular polygon. Before each new drawing, the program checks with two input gizmos to get values for the number of sides and the length of a side for a regular polygon. It then draws the polygon using that information.

Be sure to click on the input gizmos to change the number of sides and the length of the side.

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