Question

Is there a $20$ sided shape?

Answer 1

Explaining if there is a $20$ sided shape:

Yes, there is a polygon with $20$ sides. In geometry, a $20$ sided shape, i.e. $2d$ shape is called an icosagon.

The interior angle of the icosagon is given by: $180\left[\frac{\left(n-2\right)}{n}\right]$

For $n=20$, each interior angle is:

$$\begin{gathered} \Rightarrow 180\left[\frac{\left(20-2\right)}{20}\right] \\ \Rightarrow 9\times 18 \\ \Rightarrow 162° \end{gathered}$$

The sum of all the interior angles of an icosagon is$3240$degrees.

An icosagon with all equal sides is called a regular icosagon.

Since polygons start at only three sides but can go up to infinity. So, there is no limit to how many sides a polygon can have. Therefore, we can say that a polygon with $20$ sides is definitely possible without any second thoughts.

Therefore, there is a shape with $20$ sides.