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1. Use a protractor.

2. If given the interior angle, use the linear pair postulate. (180-interior angle measure)

3. If given that the polygon is regular, divide 360 by the number of angles.

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Q: How do you find the measure of an exterior angle of a polygon off of one vertex?
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The measure of an exterior angle at the vertex of a polygon equals the measure of the adjacent interior angle?

Very rarely.


Is the measure of an exterior angle at the vertex of a polygon equals the measure of the adjacent interior angle?

No. The interior angle and exterior angle at the same vertex are supplementary. Each of them is (180 degrees minus the other). In rectangles (including squares), the interior and exterior angles at each vertex are both right angles.


What is the measure of an exterior angle adjacent to the vertex angle?

It is: 180-vertex angle = exterior angle


What is the measure of the exterior angle of a 13 sided polygon if the interior angles vertex is 55 degrees?

If an interior angle is 55 deg, the corresponding exterior angle is 125 deg. This has nothing to do with the number of sides of the polygon (unless it is a regular polygon).


A convex polygon has 10 sides and one angle at each vertex what is the sum of the measure of its exterior angle?

The exterior angles of a polygon always total 360 degrees. That doesn't even depend on how many sides the polygon has.


Does the measure of an exterior angle at the vertex of a polygon equal the measure of the adjacent interior angle?

The sum of an adjacent interior and its exterior angle will total to 360°. If the angles were to be equal, they would both have to be 180°. An angle of 180° is a straight line. A polygon may be composed of straight lines that intersect at vertices but a straight line has no vertex. That being the case, the answer to your question is "No".


What is the largest exterior angle that any regular polygon can have?

The largest exterior angle measure is 120o. It is the exterior measure of an equilateral triangle (which is a regular polygon).


What does the Polygon Exterior Angle Sum Theorem say?

Theorem 6-1-2; Polygon Exterior Angle Sum Theorem:The sum of the exterior angle measures, one angle at each vertex, of a convex polygon is 360 degrees.


A convex polygon has 7 sides and one angle at each vertex Whats is the sum of exterior angles?

The sum of the exterior angles of a convex polygon which has sides and one angle at each vertex is 360 degrees.


What is the exterior angle of a 30 sided polygon?

Providing that it's a regular polygon then each exterior angle will measure 12 degrees.


What is the measure of an exterior angle of a 10 sided polygon?

If it's a regular polygon then each exterior angle measures 36 degrees


What is the formula on how to get the measure of the exterior angle of the regular polygon?

360/number of sides = exterior angle