Area of a Convex Polygon

Area of a Convex Polygon

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There is a convex polygon on a coordinate plane. This polygon is presented as a list of vertices coordinates. Each vertex is connected sequentially with the last connecting back to the first. A polygon has N vertices. You should write a program that will calculate the area of a polygon. The result should be given with one digits precision as ±0.1.

area-convex-polygon area-convex-polygon

Input: Coordinates as a list of lists. Each list contains two integers.

Output: The area of the polygon as a float.


checkio([[1, 1], [9, 9], [9, 1]]) == 32
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