五边形
拉几何学中，五边形是指有五条边搭五个顶点个多边形，渠个内角和为540度。
五边形可以分为凸五边形搭非凸五边形，其中非凸五边形包含了凹五边形搭另一种边自我相交个五角星。最简单个五角星可借由奈正五边形个对角线连起来构成。
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