Area of a Convex Polygon

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.

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

**Output: ** The area of the polygon as a float.

**Example:**

checkio([[1, 1], [9, 9], [9, 1]]) == 32 checkio([[4, 10], [7, 1],...

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