How about 'acute' angles which are greater than 0 but less than 90 degrees.
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euclid
It is a 'corner' of a polygon.
volume, vertical angles
Lots of shapes. To start with, an irregular blob (that is a technical term)!
Geometry is a part of mathematics concerned with questions of size, shape, relative position of figures and with properties of space. Geometry is one of the oldest sciences and my favorite and my favorite subject.