三角形: 三角形内角和为180度.
Triangles: The sum of the interior angles of a triangle is 180 degrees.
在局部三角化中考虑了三角形内角和顶点距离，采用规格化最小顶点距离法实现局部三角化，避免了狭长三角形出现。
A new re-triangulation method based on normalized minimum-vertex-distance was presented to avoid long and thin triangles, and it considered the vertex distance and the interior Angle of triangle.
你可以使用初等的几何知识例如三角形的三个内角各为180度和三角形全等的规则(边-角-边等)。
You may only use elementary geometry, such as the fact that the angles of a triangle add up to 180 degrees and the basic congruent triangle rules (side-angle-side, etc.).
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