The two-dimensional objects are (e) triangle and (f) plane
How to determine the geometric objects?
Two-dimensional objects are object that have a flat surface, and they extend in two directions i.e. the x and y axes.
As a general rule, two-dimensional objects are represented by flat surface.
From the list of given options, the two-dimensional objects are (e) triangle and (f) plane
Others are either one-dimensional objects or three-dimensional objects
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