一个三角形的所有角度之和是180度。

The sum of all the angles of a triangle is 180 degrees.

《柯林斯英汉双解大词典》

它的大致轮廓是一个等边三角形。

Its outline roughly forms an equilateral triangle.

《柯林斯英汉双解大词典》

所有陆龟品种都在三角形的上部形成一个紧密的点群；所有的水龟都聚集在三角图的下方。

All the land tortoise species formed a tight cluster of points in the upper part of the triangle; all the water turtles cluster in the lower part of the triangular graph.

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