Finding Interior and Exterior Angles in a Polygon

Learn how to find the Interior and Exterior Angles of a Polygon in this free math video tutorial by Mario's Math Tutoring. We discuss regular and nonregular polygons and go over the forumulas as well as example problems.
0:21 Formula for the Sum of Interior Angles in a Polygon
1:14 Formula for the Measure of 1 Interior Angle in a Regular Polygon
1:38 Formula for the Measure of 1 Exterior Angle in a Regular Polygon
1:53 Formula for the Sum of All Exterior Angles in a Polygon
2:19 Example 1 Finding Missing Interior Angle Measure
3:13 Example 2 Solving for the Exterior Angle
4:00 Example 3 Finding Interior & Exterior Angle in a Regular Decagon
5:20 Example 4 Finding the Type of Polygon Given the Sum of the Interior Angles
Related Videos:
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• Polygons Finding Numbe...
Finding an Exterior Angle in a Polygon
• Finding an Exterior An...
Find the Area of Regular Polygons
• Finding an Exterior An...
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[@MariosMathTutoring]

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[@lillianabel4382]

thank you so much sir

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I was wondering, on the 2nd problem in solving for X, you could use the proof of opposite angles are supplementary, or something like that? You had parallel lines. Thanks for the videos.

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7 years ago but still watching it whenever i forget how to solve polygons! Im so thankful to have a teacher like you❤

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[@MariosMathTutoring]

Your welcome! Glad it helped you!

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Thank you so much for this generous and perfectly explained tutorial - this was the first place that explained why this formula works!

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Glad my video helped you Natasha!

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The interior angle of a rectangular polygon is 120more than exterior angle. Find the interior angle and exterior angle

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Thanks so much! I have a quiz on this on Monday and was confused on the interior and exterior angle polygons.

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Your welcome! I’m glad my video was able to help you!

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Hassan, glad my video was helpful for you!

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You explained this a lot better than my geometry teacher! 🙏

[@MariosMathTutoring]

Glad it was helpful!

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This helped a lot! Hope you're having a wonderful day!

[@vishalbalaji3179]

THANK YOU SO much! this video helped me to know what are interior angles and exterior angles and how they are calculated, youre the reason im gonna get above 90 on my up coming exam

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best explaination video in the world

[@mrprotain5225]

Tank you very much sir I have my mid terms tommorow and i didn't really get this part so this has helped me alot I will score way better marks now thanks alot

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Cool teaching, cool teacher. Easy to understand. Am actually planing to teach polygon in my next video so i decided to check videos on polygon. Love your teaching methodology. Thanks

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Glad you like my lessons Mohamed!

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i have my exam in a couple of days, this is really helpful. Thanks a bunch :)

[@MariosMathTutoring]

Glad it helped!

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Can you please explain this question Mr. Mario ? The interior angle of a regular polygon is 150°. Find the number of sides of this polygon.

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Selina?

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Glad you liked the video!

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Happy to help!

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Finally I know how to find an interior angle with an exterior angle! Thanks so much!

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Glad you like my explanations!

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Thanks Frantzy Charles...glad you like my videos! Good luck on your exam!

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Thank you so much, sir! I have an exam this afternoon and int./ext. Angles were something i was unsure of. Now they're clear as day :)

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You’re welcome Abhishek! Glad you like my teaching style!

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