Nouns denoting two and three dimensional shapes
- right angle
- the 90 degree angle between two perpendicular lines
- hemisphere
- half of a sphere
- barrel
- a bulging cylindrical shape; hollow with flat ends
- hip
- (architecture) the exterior angle formed by the junction of a sloping side and a sloping end of a roof
- regular octahedron
- an octahedron with eight equilateral triangles as faces
- chord
- a straight line connecting two points on a curve
- concave polygon
- a polygon such that there is a straight line that cuts it in four or more points
- three-dimensional figure
- a three-dimensional shape
- angle of reflection
- the angle between a reflected ray and a line perpendicular to the reflecting surface at the point of incidence
- 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
- loop
- anything with a round or oval shape (formed by a curve that is closed and does not intersect itself)
- fold
- an angular or rounded shape made by folding
- helix angle
- the constant angle at which a helix cuts the elements of a cylinder or cone
- crease
- a slight depression or fold in the smoothness of a surface
- brachium
- (biology) a branching or armlike part of an animal
- external angle
- the supplement of an interior angle of a polygon
- dodecahedron
- any polyhedron having twelve plane faces
- oval
- a closed plane curve resulting from the intersection of a circular cone and a plane cutting completely through it
- equiangular triangle
- a three-sided regular polygon
- base
- the bottom side of a geometric figure from which the altitude can be constructed
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