#plane_figure__planefigure__two-dimensional_figure__twodimensionalfigure a two-dimensional shape
supertype: figure.shape a combination of points and lines and planes that form a visible palpable shape
subtype: heart.plane_figure a plane figure with rounded sides curving inward at the top and intersecting at the bottom; conventionally used on playing cards and valentines; "he drew a heart and called it a valentine"
subtype: polygon__polygonal_shape__polygonalshape a closed plane figure bounded by straight sides
subtype: convex_polygon a polygon such that no side extended cuts any other side or vertex; it can be cut by a line in at most two points
subtype: concave_polygon__concavepolygon a polygon such that there is a straight line that cuts it in four or more points
subtype: reentrant_polygon__reentrantpolygon__reentering_polygon a polygon with one or more reentrant angles
subtype: regular_polygon a polygon with all sides and all angles equal
subtype: equilateral_triangle__equilateraltriangle__equiangular_triangle__equiangulartriangle a three-sided regular polygon
subtype: quadrilateral__quadrangle__tetragon a four-sided polygon
subtype: parallelogram a quadrilateral whose opposite sides are both parallel and equal in length
subtype: rhombus__rhombu__rhomb a parallelogram with four equal sides; an oblique-angled equilateral parallelogram
subtype: rhomboid a parallelogram with adjacent sides of unequal lengths; an oblique-angled parallelogram with only the opposite sides equal
subtype: rectangle a parallelogram with four right angles
subtype: square__foursquare (geometry) a plane rectangle with four equal sides and four right angles; a four-sided regular polygon; "you can compute the area of a square if you know the length of its sides"
subtype: quadrate a square-shaped object
subtype: box.rectangle a rectangular drawing; "the flowchart contained many boxes"
subtype: trapezium (in US) a quadrilateral with no parallel sides
subtype: trapezoid (in US) a quadrilateral with two parallel sides
subtype: trigon__triangle__trilateral a three-sided polygon
subtype: acute_triangle__acutetriangle__acute-angled_triangle a triangle whose interior angles are all acute
subtype: equilateral_triangle__equilateraltriangle__equiangular_triangle__equiangulartriangle a three-sided regular polygon
subtype: isosceles_triangle__isoscelestriangle a triangle with two equal sides
subtype: oblique_triangle__obliquetriangle a triangle that contains no right angle
subtype: obtuse_triangle__obtuse-angled_triangle a triangle that contains an obtuse interior angle
subtype: right_triangle__righttriangle__right-angled_triangle a triangle with one right angle
subtype: scalene_triangle__scalenetriangle a triangle with no two sides of equal length
subtype: wedge_shape__wedgeshape__wedge__cuneus any shape that is triangular in cross section
subtype: pentagon a five-sided polygon
subtype: hexagon a six-sided polygon
subtype: heptagon a seven-sided polygon
subtype: octagon an eight-sided polygon
subtype: nonagon a nine-sided polygon
subtype: decagon a polygon with 10 sides and 10 angles
subtype: undecagon an eleven-sided polygon
subtype: dodecagon a twelve-sided polygon
subtype: spherical_polygon__sphericalpolygon a figure on the surface of of sphere bounded by arcs of 3 or more great circles
subtype: spherical_triangle__sphericaltriangle a spherical polygon formed by the arcs of 3 great circles
subtype: conic_section__conicsection__conic (geometry) a curve generated by the intersection of a plane and a circular cone
subtype: ellipse__oval a closed plane curve resulting from the intersection of a circular cone and a plane cutting completely through it; "the sums of the distances from the foci to any point on an ellipse is constant"
subtype: circle ellipse in which the two axes are of equal length; a plane curve generated by one point moving at a constant distance from a fixed point; "he calculated the circumference of the circle"
subtype: circle_of_curvature__osculating_circle the circle that touches a curve (on the concave side) and whose radius is the radius of curvature
subtype: equator.circle a circle dividing a sphere or other surface into two usually equal and symmetrical parts
subtype: epicycle a circle that rolls around (inside or outside) another circle; generates an epicycloid or hypocycloid
subtype: parabola a plane curve formed by the intersection of a right circular cone and a plane parallel to an element of the curve
subtype: hyperbola an open curve formed by a plane that cuts the base of a right circular cone
subtype: oblong a plane figure that deviates from a square or circle due to elongation
subtype: semicircle__hemicycle a plane figure with the shape of half a circle
subtype: sector a plane figure bounded by two radii and the included arc of a circle
subtype: star.plane_figure a plane figure with 5 or more points; often used as an emblem
subtype: hexagram a regular polygon formed by completing two equilateral triangles from a regular hexagon
subtype: asterism.star (mineralogy) a six-rayed star-shaped figure seen in some crystal structures under reflected or transmitted light
subtype: pentacle__pentagram a star with 5 points; formed by 5 straight lines between the vertices of a pentagon and enclosing another pentagon
subtype: paraboloid a surface having parabolic sections parallel to a single coordinate axis and elliptic sections perpendicular to that axis
subtype: ellipsoid a surface whose plane sections are all ellipses or circles; "the Earth is an ellipsoid"
subtype: tree_diagram__tree a figure that branches from a single root; "genealogical tree"
subtype: cladogram a tree diagram used to illustrate phylogenetic relationships
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