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A plane figure is a closed geometric figure formed using straight and or curved lines. There are several types of plane figures, grouped according to their number of sides.
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A circle is a plane figure formed by a closed curved line. Circumference, radius, diameter, central angle, circle center, and disc are terms used to describe a circle.
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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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