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Amy has worked with students at all levels from those with special needs to those that are gifted. View bio Expert Contributor Elaine Chan Dr. Chan has taught computer and college level physics, chemistry, and math for over eight years. Dr. Chan has a Ph.D. in Chemistry from U. C. Berkeley, an M.S. Physics plus 19 graduate Applied Math credits from UW, and an A.B. with honors from U.C .Berkeley in Physics. View bio Polygons are defined as any 2-dimensional shapes constructed with straight lines. Learn about the common and uncommon polygon shapes and how to design them using interior and exterior angles. Updated: 09/22/2021 Create an account DEFINITION OF A POLYGON A polygon is any 2-dimensional shape formed with straight lines. Triangles, quadrilaterals, pentagons, and hexagons are all examples of polygons. The name tells you how many sides the shape has. For example, a triangle has three sides, and a quadrilateral has four sides. So, any shape that can be drawn by connecting three straight lines is called a triangle, and any shape that can be drawn by connecting four straight lines is called a quadrilateral. Polygons All of these shapes are polygons. Notice how all the shapes are drawn with only straight lines? This is what makes a polygon. If the shape had curves or didn't fully connect, then it can't be called a polygon. The orange shape is still a polygon even if it looks like it has an arrow. All the sides are straight, and they all connect. The orange shape has 11 sides. I've mentioned a few polygons and have shown you a few common shapes. Here is a list of those in addition to several more: Shape # of Sides Triangle 3 Square 4 Rectangle 4 Quadrilateral 4 Pentagon 5 Hexagon 6 Heptagon 7 Octagon 8 Nonagon 9 Decagon 10 n-gon n sides The last entry includes the general term for a polygon with n number of sides. Polygons aren't limited to the common ones we know but can get pretty complex and have as many sides as are needed. They can have 4 sides, 44 sides, or even 444 sides. The names would be 4-gon, or quadrilateral, 44-gon, and 444-gon, respectively. An 11-sided shape can be called an 11-gon. 6:09 YOU MUST CCREATE AN ACCOUNT TO CONTINUE WATCHING REGISTER TO VIEW THIS LESSON Are you a student or a teacher? I am a student I am a teacher Create Your Account To Continue Watching As a member, you'll also get unlimited access to over 84,000 lessons in math, English, science, history, and more. Plus, get practice tests, quizzes, and personalized coaching to help you succeed. Get unlimited access to over 84,000 lessons. Try it now It only takes a few minutes to setup and you can cancel any time. ALREADY REGISTERED? LOG IN HERE FOR ACCESS Back RESOURCES CREATED BY TEACHERS FOR TEACHERS Over 30,000 video lessons & teaching resources‐all in one place. Video lessons Quizzes & Worksheets Classroom Integration Lesson Plans I would definitely recommend Study.com to my colleagues. It’s like a teacher waved a magic wand and did the work for me. I feel like it’s a lifeline. Jennifer B. Teacher Try it now Back Coming up next: Parallelograms: Definition, Properties, and Proof Theorems YOU'RE ON A ROLL. KEEP UP THE GOOD WORK! Take Quiz Watch Next Lesson Replay JUST CHECKING IN. ARE YOU STILL WATCHING? Yes! Keep playing. Your next lesson will play in 10 seconds * 0:01 Definition of a Polygon * 1:54 Regular Polygons * 3:02 Angles of Regular Polygons * 5:35 Lesson Summary Save Save Save Want to watch this again later? Log in or sign up to add this lesson to a Custom Course. Log in or Sign up Timeline Autoplay Autoplay Speed Normal * 0.5x * Normal * 1.25x * 1.5x * 1.75x * 2x Speed 786K views * Video * Quiz * Course 786K views REGULAR POLYGONS A special class of polygon exists; it happens for polygons whose sides are all the same length and whose angles are all the same. When this happens, the polygons are called regular polygons. A stop sign is an example of a regular polygon with eight sides. All the sides are the same and no matter how you lay it down, it will look the same. You wouldn't be able to tell which way was up because all the sides are the same and all the angles are the same. When a triangle has all the sides and angles the same, we know it as an equilateral triangle, or a regular triangle. A quadrilateral with all sides and angles the same is known as a square, or regular quadrilateral. A pentagon with all sides and angles the same is called a regular pentagon. An n-gon with sides and angles the same is called a regular n-gon. Regular polygons Here is a regular triangle, a regular quadrilateral, and a regular pentagon. Do you see how all the sides are the same and no matter how you flip it, it will look the same? ANGLES OF REGULAR POLYGONS Regular polygons also have two different angles related to them. The first is called the exterior angle, and it is the measurement between the shape and each line segment when you stretch it out past the shape. The exterior angle However many sides a polygon has is the same number of exterior angles it has. So, a pentagon with five sides has five exterior angles. A hexagon will have six exterior angles and so on. For regular polygons, we can figure out the measurement of the exterior angle, but for polygons that aren't regular, we can't. Here is the formula for regular polygons: The exterior angle formula The n stands for the number of sides the polygon has. So, a pentagon has exterior angles that measure 360 / 5 = 72 degrees. The second angle is called the interior angle, which is the supplementary angle to the exterior angle. This means that the interior angle together with the exterior angle will add up to 180 degrees. The interior angle You can also say that the interior angle is the measurement of each corner of the polygon. Here is the formula for the interior angle: The interior angle formula The second formula is the same as the first, just rearranged. Don't worry about how we got there right now; just remember one or the other, and you will be okay. The second one is the more commonly seen in the math world. Let's look at an example. For our pentagon with five sides, using the first equation gives us 180 - 360 / 5 = 180 - 72 = 108 degrees. Using the second equation, we get (5 - 2) * 180 / 5 = 3 * 180 / 5 = 540 / 5 = 108 degrees. Both formulas will give us the same answer. Choose the formula that is easier for you to remember. LESSON SUMMARY Polygons are all around us. Who of us has ever seen a triangle or a square? A polygon is defined as a 2-dimensional shape with straight sides. Regular polygons have sides and angles that are all the same. While you can find the measurements of the exterior and interior angles of regular polygons, you can't with polygons that aren't regular. LEARNING OUTCOMES After this lesson, you should be able to: * Define polygon and regular polygon * Identify examples of polygons and regular polygons * Explain how to find the exterior and interior angles of regular polygons To unlock this lesson you must be a Study.com Member. Create your account Additional Activities SUM OF POLYGON INTERIOR ANGLES Each segment that forms a polygon is a side of the polygon. The endpoint of two sides is a vertex of the polygon. A segment that connects any two nonconsecutive vertices is a diagonal. A polygon is concave if any part of a diagonal contains points in the exterior of the polygon. If no diagonal contains points in the exterior, then the polygon is convex. A regular polygon is always convex. To find the sum of the interior angle measures of a convex polygon, draw all possible diagonals from one vertex of the polygon. This creates a set of triangles. The sum of the angle measures of all the triangles equals the sum of the angle measures of the polygon. PLEASE FILL IN THE BLANKS For the triangle, the number of sides = _____. The number of triangles =_____. The sum of interior angle measures = ( _____ ) 180 degrees. For the quadrilateral, the number of sides = _____. The number of triangles =_____. The sum of interior angle measures = ( _____ ) 180 degrees. For the pentagon, the number of sides = _____. The number of triangles =_____. The sum of interior angle measures = ( _____ ) 180 degrees. For the hexagon, the number of sides = _____. The number of triangles =_____. The sum of interior angle measures = ( _____ ) 180 degrees. For the n-gon, the number of sides = _____. The number of triangles =_____. The sum of interior angle measures = ( _____ ) 180 degrees. In each convex polygon, the number of triangles formed is two less than the number of sides n. So the sum of the angle measures of all these triangles is (n - 2 ) 180 degrees. The measure of each interior angle of a regular n-gon is (n-2)180/n degrees. ANSWERS: Triangle: 3,1,1 Quadrilateral: 4,2,2 Pentagon: 5,3,3 Hexagon: 6,4,4 n-gon: n, n-2, n-2 REGISTER TO VIEW THIS LESSON Are you a student or a teacher? I am a student I am a teacher UNLOCK YOUR EDUCATION SEE FOR YOURSELF WHY 30 MILLION PEOPLE USE STUDY.COM BECOME A STUDY.COM MEMBER AND START LEARNING NOW. Become a Member Already a member? Log In Back RESOURCES CREATED BY TEACHERS FOR TEACHERS Over 30,000 video lessons & teaching resources‐all in one place. Video lessons Quizzes & Worksheets Classroom Integration Lesson Plans I would definitely recommend Study.com to my colleagues. 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What is a Polygon? - Definition, Shapes & Angles Start today. Try it now Math / Geometry: High School Geometry: High School 14 chapters | 145 lessons {{courseNav.course.topics.length}} chapters | {{courseNav.course.mDynamicIntFields.lessonCount}} lessons | {{course.flashcardSetCount}} flashcard set{{course.flashcardSetCoun > 1 ? 's' : ''}} Ch 1. High School Geometry: Foundations of... * Go to High School Geometry: Foundations of Geometry Ch 2. High School Geometry: Logic in... * Go to High School Geometry: Logic in Mathematics Ch 3. High School Geometry: Introduction to... * Go to High School Geometry: Introduction to Geometric Figures Ch 4. High School Geometry: Properties of... * Go to High School Geometry: Properties of Triangles Ch 5. High School Geometry: Triangles,... * Go to High School Geometry: Triangles, Theorems and Proofs Ch 6. High School Geometry: Parallel Lines... * Go to High School Geometry: Parallel Lines and Polygons Ch 7. High School Geometry: Similar Polygons * Ratios and Proportions: Definition and Examples 5:17 * Geometric Mean: Definition and Formula 5:15 * Angle Bisector Theorem: Definition and Example 4:58 * Solving Problems Involving Proportions: Definition and Examples 5:22 * Similar Polygons: Definition and Examples 8:00 * The Transitive Property of Similar Triangles 4:50 * Triangle Proportionality Theorem 4:53 * Constructing Similar Polygons 4:59 * Properties of Right Triangles: Theorems & Proofs 5:58 * The Pythagorean Theorem: Practice and Application 7:33 * The Pythagorean Theorem: Converse and Special Cases 5:02 * Similar Triangles & the AA Criterion 5:07 * What is a Polygon? - Definition, Shapes & Angles 6:08 * Go to High School Geometry: Similar Polygons Ch 8. High School Geometry:... * Go to High School Geometry: Quadrilaterals Ch 9. High School Geometry: Circular Arcs and... * Go to High School Geometry: Circular Arcs and Circles Ch 10. High School Geometry: Conic... * Go to High School Geometry: Conic Sections Ch 11. High School Geometry: Geometric... * Go to High School Geometry: Geometric Solids Ch 12. High School Geometry: Analytical... * Go to High School Geometry: Analytical Geometry Ch 13. High School Geometry:... * Go to High School Geometry: Probability Ch 14. High School Geometry: Introduction to... * Go to High School Geometry: Introduction to Trigonometry WHAT IS A POLYGON? - DEFINITION, SHAPES & ANGLES RELATED STUDY MATERIALS RECOMMENDED LESSONS AND COURSES FOR YOU * Related Lessons * Related Courses RELATED LESSONS Polygon Characteristics & Examples | What are Polygons? What is a Regular Polygon? - Lesson for Kids Regular Polygons: Definition & Parts Constructing Similar Polygons Constructing Perpendicular Lines in Geometry Names of Polygons Irregular Polygon Shapes & Examples | What is an Irregular Polygon? Convex vs. Concave Polygons | Concept, Differences & Examples Finding the Perimeter of Polygons Triangles: Definition and Properties Pentagon Shape & Area | How Many Sides Does a Pentagon Have? Right Angle Shapes: Overview & Examples | What Shapes Have Right Angles? Polygons: Symmetry & Vertices Three-Dimensional Shapes: Overview & Types | What is a Three-Dimensional Shape? Heptagon Shape | Examples Parallel Sides Concept & Examples | What Are Parallel Sides? Line Segments & Rays | Differences & Measurement Parallelogram Shape in Geometry | Sides & Examples Hexagon Lesson for Kids: Definition & Facts Trapezoid Shape, Types & Examples | What is a Trapezoid? 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