Plane figure with three sides is called:

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rectangle

triangle

quadrilateral

none of these

answer is B.

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Detailed Solution

Given a plane figure that has 3 sides.
A plane figure can be made of straight lines, curved lines, or both straight and curved lines. A rectangle is made of 4 straight lines with opposite sides equal and all angles 90°.
A triangle is made of 3 straight lines.
A quadrilateral is made of 4 straight lines.
Thus, triangle is the only geometric figure that has 3 sides.
Therefore, option (2) is correct.

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