# what is a regular pentagon

Regular Vs. Irregular Polygons. A regular polygon has three parts: Sides .

If the polygon has unequal sides and angles, then it is called irregular. Used by over Anyone can earn For the headquarters of the United States Department of Defense, see An equilateral pentagon, i.e. She has primarily taught Middle School Math and has a Master's degree in Educational Leadership.Today in class Cheyenne is learning about a shape called a pentagon. Right away, she can tell that all the sides are not equal, making this pentagon irregular. If the angles and sides are the same, she knows a pentagon is a regular polygon. Pythagorean Theorem Lesson for Kids: Definition & Examples imaginable degree, area of In the limit, a sequence of regular polygons with an increasing number of sides approximates a circle, if the perimeter or area is fixed, or a regular apeirogon, if the edge length is fixed. This method works for regular pentagons, with five equal sides. Cheyenne concludes that pentagons can be both regular and irregular polygons.

Circumference Lesson for Kids: Definition & Formula If even one of those features is not present, you do not have a regular polygon.

first two years of college and save thousands off your degree. The names of the regular polygons come from the number of sides they have. To figure this out, she must find the measurements of the sides and angles of a pentagon. Ch. 3:01 Start with the side length and apothem. (A polygon is "regular" only when all angles are equal and all sides are equal, otherwise it is irregular.) Parts of a regular polygon . The Complete K-5 Math Learning Program Built for Your ChildThe interior angle is the angle formed within the enclosed surface of the polygon by joining the sides. "The converse of Viviani's theorem", Chakerian, G.D. "A Distorted View of Geometry."

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and n." OED Online. Joy has been a teacher for over ten years.

From MathWorld--A Wolfram Web Resource. courses that prepare you to earn credit-by-exam regardless of age or education level.Not sure what college you want to attend yet?

In geometry, a pentagon is any five-sided polygon or 5-gon. All vertices of a regular polygon lie on a common circle (the Together with the property of equal-length sides, this implies that every regular polygon also has an inscribed circle or In certain contexts all the polygons considered will be regular. When Cheyenne measures all the angles of the yellow pentagon, she discovers that they all equal 108 degrees and all the sides equal 5 cm.

Besides the side length, you'll need the "apothem" of the pentagon. 2:39

The circle defining the pentagon has unit radius. She has learned that: Now she has to figure out if a pentagon is a regular polygon or an irregular polygon. However, its five internal angles can take a range of sets of values, thus permitting it to form a family of pentagons. Angles: interior and exterior . Each subgroup symmetry allows one or more degrees of freedom for irregular forms. All other trademarks and copyrights are the property of their respective owners.

The Pentagon is the headquarters building of the United States Department of Defense.As a symbol of the U.S. military, the phrase The Pentagon is also often used as a metonym for the Department of Defense and its leadership.. From trigonometry, we know that the cosine of twice 18 degrees is 1 minus twice the square of the sine of 18 degrees, and this reduces to the desired result with simple quadratic arithmetic.

3:10 Different regular polygons . A polygon that does not have all sides equal and all angles equal.

A regular polygon is a polygon with all sides of equal length and all interior angles of equal measure. Regular polygons may be either convex or star.

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