Cone: A solid or hollow object that tapers from a circular or roughly circular base to a point.Sphere: A round body whose surface is at all points equidistant from the center.Cube: A three-dimensional figure with identical equilateral squares as faces (a cube is also a prism, see square prism below).Octagon: A closed figure with eight sides.Septagon/Heptagon: A closed figure with seven sides.
Hexagon: A closed figure with six sides.Pentagon: A closed figure with five sides.Square: A special type of rectangle that has equilateral (same length) sides and parallel opposite sides.Rhombus: A closed four-sided figure with parallel opposite sides.Rectangle: A two-dimensional, closed, four-sided figure with four right angles.Triangle: A closed figure with three sides.Circle: A two-dimensional shape in which all points on the curved line are equidistant from a center point.Wavy: Having curvy or undulating attributes (e.g., ocean, octopus tentacles).The point at which two sides of a two-dimensional figure or two edges of a three-dimensional figure meet. Vertex/Vertices: Also known as corner/corners.Side: Line segments in geometric figures that compose the exterior of the object.Pointy: An informal word to describe angles of objects.Point: A specific position on a line, plane, or in space.Plane: A flat two-dimensional surface upon which two-dimensional objects (e.g., circle, square) can lie, or the face of a three-dimensional object as it creates a surface (e.g., face of a cube) the dimensions of which are infinite.A parallelogram has two sets of parallel lines. Parallel: Two lines in a two-dimensional space that do not meet (for example, the opposite sides of a square).Location terms: Words and phrases that describe the location of an object in relation to other objects, including words like on, under, on top of, next to, in front of, behind, beneath, underneath, inside, outside, at/on the bottom/top, between, and adjacent to (this is just a sample, there are many more).Equilateral: Sides that are the same length.Face: Surface planes of three-dimensional shapes.Edge: The meeting of two faces on a three-dimensional shape.With young children, the terms large, medium, small, taller, shorter, longer, less than and greater than are all appropriate. Dimensions/Size: Terminology to describe the dimensions of an object or set.Congruent: Identical in size and shape.
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