That would be an equilateral triangle.
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A 13 sided regular polygon
4320
Providing that it is a regular 38 sided polygon then each interior angle will measure: 170o31'34.74''
The equation for the size of an interior angle of an n-sided regular polygon is (n-2)180/n. When n=7, the interior angle of a regular sided shape would be 5x180/7 or approximately 128.57. The polygon in the question has an interior right angle (90 degree angle) and thus cannot be a regular shape. A 7 sided shape is called a heptagon. Thus, the shape described in the question is an irregular heptagon.