Which figure represents an undefined term?

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Which figure represents an undefined term?

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4th figure, where XY is a line.

Step by step explanation:

There are 3 undefined terms: 1) point 2) line 3) plane

From top to bottom, the first figure represents a radius (end point at X) which is a defined term and is defined as “A radius is a line with one end point.”

The second figure represents a segment with 2 end points at X and Y and is a defined term and is defined as “A segment is a line with 2 end points.”

The third figure is a component of two rays and they are making an angle which is again a defined term.

The last figure shows a line that has no endpoints and is an undefined term.

Hence, the last figure represents an unspecified term “line”.