Step-by-step explanation:

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For a 30 sided regular polygon, We can divide the polygon (30 sides) into 30 inscribed triangles with central vertex angles of =
.
This central vertex angle of <u>12 degrees</u> is the degree of rotation for a 30 sided polygon.
In other words, the 30 sided polygon has <u>12 degree</u> rotational symmetry about the center.
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His stomach is gonna hurt really bad
155.2 + 0.4 = 155.6
155.2 - 0.4 = 154.8
so it ranges from : 154.8 to 155.6