Problem:
A polygon with $9$ vertices has the coordinates $\left(
\begin{array}{cc}
 -0.361 & 0.444 \\
 -0.22 & 0.211 \\
 -0.219 & 0.493 \\
 0. & 0. \\
 0.213 & 0.116 \\
 0.394 & 0.605 \\
 0.434 & 0.591 \\
 0.529 & 0.393 \\
 0.537 & 0.447 \\
\end{array}
\right)$. Estimate the polygon's interior angles (in radians), area, and perimeter. Also, classify the polygon as 'Simple' or 'Convex'.
Answer:
Type: Convex 
Area: $0.31$ 
Angles: $\{1.36,2.88,1.88,2.92,2.43,2.38,2.52,2.62,2.99\}$ 
Perimeter: $2.29$
{'source': 'AMPS', 'file': 'amps/mathematica/geometry/polygons/27888.txt'}