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what do you call the angle formed when the side of a polygon is extended?

what is the measure of one of the interior angles in a regular Pentagon?

what is the sum of the interior angles in a regular heptagon?​

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Answer:

1. The angle formed in the exterior of the polygon is called "exterior angle"

2. 108 degrees

108 degreesThe measure of one interior angle of a regular pentagon is 108 degrees.

3. 900 degrees

900 degreesHeptagon Properties

900 degreesHeptagon PropertiesIn heptagon, the sum of the interior angles is equal to 900 degrees. The sum of exterior angles of a heptagon is 360 degrees. For regular heptagon, the measure of the interior angle is about 128.57 degrees. The measure of the central angle of a regular heptagon is approximately 51.43 degrees

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