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Given a list of points that form a polygon when joined sequentially, find if this polygon is convex (Convex polygon definition).

**Note:**

- There are at least 3 and at most 10,000 points.
- Coordinates are in the range -10,000 to 10,000.
- You may assume the polygon formed by given points is always a simple polygon (Simple polygon definition). In other words, we ensure that exactly two edges intersect at each vertex, and that edges otherwise
**don't intersect each other**.

**Example 1:**

[[0,0],[0,1],[1,1],[1,0]] Answer: True Explanation:

**Example 2:**

[[0,0],[0,10],[10,10],[10,0],[5,5]] Answer: False Explanation:

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