Isosceles 等腰（三角形）
Equilateral 等边
Congruent 全等 ≅
Similar Triangles 相似三角形（SSS，SAS，AA，RHS）|||
Hypotenuse (直角三角形) 斜边
Altitude 高
Diagonal 对角线
Circumscribed Circle 顶点外周圆
Bisect 平分
Dissect Dissection 切分
Pythagoras' Theorem 毕达哥拉斯 勾股定理
THEOREM: The interval parallel to one side of a triangle and half its length bisects the other two sides.
THEOREM: The quadrilateral formed by the midpoints of the sides of a quadrilateral is a parallelogram.
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