An obtuse angle is one that is more than 90 degrees, but less than 180 degrees.

钝角是大于九十度同时小于一百八十度的角。

Every time you make a cut that reaches an edge, it either makes an acute and an obtuse angle, or two right angles.

每次切割到达边缘时，它要么形成一个锐角和一个钝角， 要么形成两个直角。