# Index For Geometry Terms And Definitions, Index For Geometry

**Index For Geometry Terms And Definitions, Index For Geometry**in

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**Attributes and Spatial Properties **Qualities (usually used with geometry) of a figure, including sides, size, angles, etc.

Đang xem: Geometry terms

**Angle: **Two lines that meet to make a corner.**Congruent: **Identical in size and shape.**Dimensions/Size: **Terminology to describe the dimensions of an object or set. With young children, the terms *large, medium, small, taller, shorter, longer, less than *and *greater than* are all appropriate.**Edge: **The meeting of two faces on a three-dimensional shape.**Face: **Surface planes of three-dimensional shapes.**Flat: **Having a plane-like quality.**Equilateral:** Sides that are the same length.**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).**Parallel**: Two lines in a two-dimensional space that do not meet (for example, the opposite sides of a square). A parallelogram has two sets of parallel lines.**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.**Point: **A specific position on a line, plane, or in space.**Pointy: **An informal word to describe angles of objects.**Side**: Line segments in geometric figures that compose the exterior of the object.**Straight: **Without a curve.**Vertex/Vertices:** Also known as corner/corners. The point at which two sides of a two-dimensional figure or two edges of a three-dimensional figure meet.

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**Wavy:** Having curvy or undulating attributes (e.g., ocean, octopus tentacles).**Two-Dimensional Figures****Circle**: A two-dimensional shape in which all points on the curved line are equidistant from a center point.**Triangle:** A closed figure with three sides.**Rectangle:** A two-dimensional, closed, four-sided figure with four right angles.**Rhombus: **A closed four-sided figure with parallel opposite sides. A square is a special kind of rhombus. Sometimes called a *diamond*.**Square: **A special type of rectangle that has equilateral (same length) sides and parallel opposite sides.**Pentagon: **A closed figure with five sides.**Hexagon:** A closed figure with six sides.**Septagon/Heptagon: **A closed figure with seven sides.**Octagon: **A closed figure with eight sides.**Three-Dimensional Figures****Cube:** A three-dimensional figure with identical equilateral squares as faces (a cube is also a *prism*, see *square prism* below).**Sphere:** A round body whose surface is at all points equidistant from the center.**Cone:** A solid or hollow object that tapers from a circular or roughly circular base to a point.**Pyramid: **A three-dimensional figure on which the faces are triangular and converge to a single point at the top. Pyramids are named after the shape of their base (triangular pyramid, square pyramid, rectangular pyramid).

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**Prism: **A three-dimensional figure with identical ends. Named after the two-dimensional shape at the ends. For instance, a rectangular prism has identical rectangles at each end. A hexagonal prism has identical hexagons at each end: triangular prism, square prism (also called a *cube*), rectangular prism, pentagonal prism, hexagonal prism, heptagonal prism, octagonal prism.

**Geometry**