Problem:
A polygon with $3$ vertices has the coordinates $\left(
\begin{array}{cc}
 0. & 0. \\
 0.489 & 0.021 \\
 0.868 & 0.52 \\
\end{array}
\right)$. Estimate the polygon's interior angles (in radians), area, and perimeter. Also, classify the polygon as 'Simple' or 'Convex'.
Answer:
Area: $0.12$ 
Angles: $\{0.5,2.26,0.38\}$ 
Type: Convex 
Perimeter: $2.13$
{'source': 'AMPS', 'file': 'amps/mathematica/geometry/polygons/47972.txt'}