Geometry Vocabulary
angle
A figure formed by two rays, called the sides of the angle, sharing a common endpoint, known as the vertex.
circle
A round plane figure whose boundary consists of points equidistant from the center.
Glossary Reference
List of common words related to geometry.
angle
A figure formed by two rays, called the sides of the angle, sharing a common endpoint, known as the vertex.
circle
A round plane figure whose boundary consists of points equidistant from the center.
triangle
A three-sided polygon.
rectangle
A four-sided polygon (quadrilateral) with opposite sides that are equal in length and all angles being right angles.
quadrilateral
A four-sided polygon with four angles.
perimeter
The total distance around the outside of a two-dimensional shape.
area
A particular space or region; a field of study or activity.
volume
The amount of space that a substance (solid, liquid, gas) occupies, often measured in cubic units.
parallel
A person or thing that is similar to another.
perpendicular
Describing lines or surfaces that meet at a right angle (90 degrees).
radius
The distance from the center of a circle or sphere to its outer edge.
diameter
The length of a straight line passing through the center of a circle or sphere, connecting two points on its boundary.
circumference
The distance around the edge of a circle.
polygon
A polygon is a two-dimensional geometric figure that is made up of straight line segments, which are connected to form a closed shape.
symmetry
The quality of being made up of exactly similar parts facing each other or around an axis.
vertex
The highest point or peak of something, especially in geometry.
edge
The border or boundary of something; the point at which something begins.
plane
A flat or level surface; an aircraft that is heavier than air and has wings.
tessellation
A pattern made of one or more geometric shapes that fit together without any gaps or overlaps.
congruent
In agreement or harmony; having the same size and shape.
List Mastery
Complete all practice modes to achieve fluency.