New Words：

triangle [ˈtraɪæŋɡl] n. 三角形;三角形物体

Sample Sentences：

Cut the sandwiches into triangles.
The angles of a triangle total 180.
The sum of all the angles of a triangle is 180 degrees.

sum [sʌm] n. 和，总和，总数;全部，一切
angle [ˈæŋɡl] n. 角;斜角

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