(Geometry: display an n-sided regular polygon) Programming Exercise 13.25 created the Regular Polygon Panel for displaying an n-sided regular polygon. Write a program that displays a regular polygon and uses two buttons named and to increase or decrease the size of the polygon, as shown in Figure 16.30a–b. Also enable the user to increase or decrease the size by clicking the right or left mouse button and by pressing the UP and DOWN arrow keys.
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