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四色定理
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Prove 相鄰的邊最多4個 that means 平均相鄰的邊的角度是360/4‎ = 90度，那是平均值，和人習慣看相鄰的邊界最多的度數 

假如是鈍角、另一邊的線條就是銳角如果只取一邊鈍角，另一邊無接觸，就能破解四色定理，就需要五色才能填滿，以下是概念圖。

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