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A plane figure is a closed geometric figure formed using straight or curved lines. There are several kinds of plane figures, grouped according to their number of sides.
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A polygon is a closed plane figure formed by at least three straight line segments joined end-to-end.
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Parallel lines are lines that never meet even when they are extended. Perpendicular lines are two lines that intersect at a right angle.
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An angle (∠) is formed by two lines or line segments that meet at a vertex. There are different types of angles, including right, acute, and obtuse angles.
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A solid is a three-dimensional object composed of faces that can be plane or curved. There are two main categories of solids: solids with curved surfaces and polyhedrons.
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