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Polygon name what is the name of the 8 sided polygon

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Posted on Apr 15, 2014

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I s a p e n t a g o n a p o l l y g o n ? I w a n t t o k n o w ?

It's my understanding that a polygon is a multisided plain figure ( a two dimensional figure.). This means that a triangle - 3 sides, a square - 4 sides, a pentagon - 5 sides, a hexagon - 6 sides, (I'm not sure but I think a seven sided figure is a heptagon?), an octagon - 8 sides, a nonagon - 9 sides, a decagon - 10 sides, etc. are each examples of polygons.

Mar 20, 2017 | Miscellaneous

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Names of all polygons

Since there are an infinite number of polygons, I can't list all of their names. For the names of all polygons with up to 100 sides, see

Jun 05, 2014 | Computers & Internet

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Whats a polygon with four sides

The usual name for a polygon with 4 sides is quadrilateral. You could call it tetragon too, but that is not common.

Mar 17, 2014 | Office Equipment & Supplies

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I do not know every shape on earth like a octagon has 8 sides a decagon has 9 sides but what are the rest

Actually, a decagon has 10 sides while a nonagon has 9 sides.

Not every polygon has a name, since there are an infinite possibilities for the number of sides. You can see the names for many of them at

Mar 03, 2014 | Computers & Internet

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10 sided names of polygons

10 sides Decagon

3 Triangle

4 Quadrilateral

5 Pentagon

6 Hexagon

7 Heptagon

8 Octagon

9 Nonagon

11 Undecagon

12 Dodecagon

Dec 10, 2013 | Office Equipment & Supplies

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Sslc maths

What follows is true for CONVEX polygons.
Let n be the number of sides of a convex polygon, and let n be greater than or equal to 4, then
The number of diagonals is given by n*(n-3)/2
Using this rule, write n*(n-3)/2=20. Clear the fraction, open brackets. You end up with n^2-3n-40=0.
Factor the polynomial or use the formulas for the quadratic equation to find the roots as n=-5 or n=8. Discard the negative root because n must be positive.

Oct 05, 2013 | Computers & Internet

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What is a polygon with 15 diagonals

For convex polygons there is a relation linking the number of sides to the number of diagonals. Here it is, with n=number of sides
number of diagonals=n*(n-3)/2. Obviously the number of sides must be greater or equal to 3.
If you use the relation for a hexagon (n=6) the number of diagonals is 9. With n=7, the number of diagonals is 14, and for n=8 the number of diagonals is 8*(8-3)/2=20. The answer is that there does not exist a CONVEX polygon with 15 diagonals.
You can also try to solve the quadratic equation n(n-3)/2=15 for a positive integer. And you will not find a solution.
For polygons that are not convex there may be many solutions or no solutions. I leave that to you as an exercise.

Mar 11, 2013 | SoftMath Algebrator - Algebra Homework...

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