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A plane figure with three straight sides and three angles.
A polygon.
A rectangle is a plane figure with four straight sides and four right angles, esp. one with unequal adjacent sides. A square is a plane figure with four equal straight sides and four right angles. A rhombus is a parallelogram with opposite equal acute angles, opposite equal obtuse angles, and four equal sides.
A polygon is a plane figure with at least three straight sides and angles, so a triangle qualifies.
A plane figure with at least three straight sides and angles, and typically five or more.
hendecagon
A polygon is a plane figure with 3 or more straight sides and angles. A plane figure is a flat enclosed figure made of straight lines, curved lines, or both.
It is a quadrilateral
A plane figure with three straight sides and three angles.
A Polygon is a closed plane figure bounded by straight sides.Polygons is a plane figure with more than 3 straight sides and angles and are typically 5 or more.
A polygon.
A rectangle is a plane figure with four straight sides and four right angles, esp. one with unequal adjacent sides. A square is a plane figure with four equal straight sides and four right angles. A rhombus is a parallelogram with opposite equal acute angles, opposite equal obtuse angles, and four equal sides.
A polygon is a plane figure with at least three straight sides and angles, so a triangle qualifies.
A plane figure with at least three straight sides and angles, and typically five or more.
A quadrilateral is a closed plane figure with four straight sides.
It is a polygon that is a closed plane figure with 3 or more straight lines.
They're asking for the definition, which is a plane figure with at least three straight sides and angles, and typically five or more.