Problem:
A polygon with $4$ vertices has the coordinates $\left(
\begin{array}{cc}
 0.356 & 0.889 \\
 0.531 & 0.37 \\
 0.657 & 0.845 \\
 0.882 & 0.512 \\
\end{array}
\right)$. Estimate the polygon's interior angles (in radians), area, and perimeter. Also, classify the polygon as 'Simple' or 'Convex'.
Answer:
Type: Simple 
Area: $0.15$ 
Perimeter: $1.63$ 
Angles: $\{1.1,1.51,1.36,2.31\}$
{'source': 'AMPS', 'file': 'amps/mathematica/geometry/polygons/43517.txt'}