Geometry Vocabulary

a closed two-dimensional shape formed by three or more straight sides that are line segments

• polygon
• triangle
• circle
• rectangle

a polygon with 4 sides and 4 angles

• Pentagon
• Triangle
• Quadrilateral
• Hexagon

a quadrilateral whose opposite sides are parallel and of equal length

• Rectangle
• Square
• Trapezoid
• Parallelogram

a quadrilateral with exactly one set of parallel lines

• Square
• Rectangle
• Rhombus
• Trapezoid

a quadrilateral with two sets of parallel sides and 4 equal side lengths

• rectangle
• square
• trapezoid
• rhombus

lines in the same plane that never intersect and are always the same distance apart

• Parallel lines
• Perpendicular lines
• Curved lines
• Intersecting lines

two lines that intersect to form a right angle

• Perpendicular lines
• Skew lines
• Intersecting lines
• Parallel lines

two lines that cross each other at exactly one point

• Intersecting lines
• Perpendicular lines
• Collinear points
• Parallel lines

an exact location in space

• Point

• Spatial reference
• Geographical point
• Location marker

a straight path of points in a plane that continues without end in both directions with no end points

• ray
• curve
• line
• segment