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#!/usr/bin/python3
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import turtle
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# The sum of the inner angles of a polygon
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# in an euclidian plane:
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n = 7
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inner_angle_sum = (n - 2) * 180
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# Distance between two vertices
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l = 70
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for i in range(n):
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turtle.forward(l)
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turtle.right(180 - inner_angle_sum / n)
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turtle.mainloop()
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