Problem:
A polygon with $9$ vertices has the coordinates $\left(
\begin{array}{cc}
 -0.21 & 0.023 \\
 -0.056 & 0.483 \\
 0. & 0. \\
 0.117 & 0.662 \\
 0.197 & 0.738 \\
 0.255 & 0.019 \\
 0.404 & 0.474 \\
 0.59 & 0.159 \\
 0.615 & 0.088 \\
\end{array}
\right)$. Estimate the polygon's interior angles (in radians), area, and perimeter. Also, classify the polygon as 'Simple' or 'Convex'.
Answer:
Angles: $\{1.35,2.96,3.02,1.42,2.95,3.01,1.48,3.1,2.7\}$ 
Perimeter: $2.46$ 
Type: Convex 
Area: $0.36$
{'source': 'AMPS', 'file': 'amps/mathematica/geometry/polygons/9498.txt'}