#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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