# Nouns denoting two and three dimensional shapes

- reflex angle
- an angle greater than 180 degrees (but less than 360)

- leaf shape
- any of the various shape that leaves of plants can assume

- acute angle
- an angle less than 90 degrees but more than 0 degrees

- convex polygon
- a polygon such that no side extended cuts any other side or vertex; it can be cut by a straight line in at most two points

- orbital plane
- (astronomy) the plane on which a body is orbiting

- convex polyhedron
- a polyhedron any plane section of which is a convex polygon

- element of a cylinder
- a straight line running the length of the cylinder

- connection
- a connecting shape

- nonagon
- a nine-sided polygon

- point
- a very small circular shape

- sag
- a shape that sags

- curve
- the trace of a point whose direction of motion changes

- oblique angle
- an angle that is not a right angle or a multiple of a right angle

- ray
- (mathematics) a straight line extending from a point

- diagonal
- (geometry) a straight line connecting any two vertices of a polygon that are not adjacent

- oblique triangle
- a triangle that contains no right angle

- bifurcation
- a bifurcating branch (one or both of them)

- ovoid
- an egg-shaped object

- sector
- a plane figure bounded by two radii and the included arc of a circle

- plane
- (mathematics) an unbounded two-dimensional shape

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