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Any polygon has a total external angle of 360 degrees
This is split between all the angles around the shape, n the case of a regular polygon they would also be equal, so the external angles would be 360 / 12, which is 30.
However you need to know the internal angles
As you know there are 180 degrees in a straight line, the external angle is 30 degrees as explained above, so the internal angle is 180 - 30, which is 150 degrees
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What type of an interior angle of a polygon and its adjacent exterior angle are complementary?
The interior angle of a polygon and its adjacent exterior angle can never be complementary.
What is the exterior angle of a tricontakaitrigon?
The exterior angle of any polygon, including a tricontakaitrigon, is the angle formed between one side of the polygon and the extension of an adjacent side. The measure of the exterior angle of a regular tricontakaitrigon is 2 degrees, as each interior angle of this polygon measures 178 degrees.
An interior angle of a polygon that is not adjacent to the exterior angle?
Ah...
What is the difference between a regular polygon and polygon?
A regular polygon is one whose angle measurements are all equal and side lengths are all equal. === ===
How do you find the arc length of a circle that has an inscribed polygon?
What do you mean by "arc length of a circle"? If you mean the arc length between two adjacent vertices of the inscribed polygon, then: If the polygon is irregular then the arc length between adjacent vertices of the polygon will vary and it is impossible to calculate and the angle between the radii must be measured from the diagram using a protractor if the angle is not marked. The angle is a fraction of a whole turn (which is 360° or 2π radians) which can be multiplied by the circumference of the circle to find the arc length between the radii: arc_length = 2πradius × angle/angle_of_full_turn → arc_length = 2πradius × angle_in_degrees/360° or arc_length = 2πradius × angle_in_radians/2π = radius × angle_in_radians If there is a regular polygon inscribed in a circle, then there will be a constant angle between the radii of the circle between the adjacent vertices of the polygon and each arc between adjacent vertices will be the same length; assuming you know the radius of the circle, the arc length is thus one number_of_sides_th of the circumference of the circle, namely: arc_length_between_adjacent_vertices_of_inscribed_regular_polygon = 2πradius ÷ number_of_sides
