Geometry Vocabulary

Front

Total space of a 2-D object

Back

Area

Front

Lines that intersect at a right angle, 90°

Back

Perpendicular lines

Tags

CCSS.HSG.CO.A.1

Front

The measurement around a 2-D object

Back

Perimeter

Front

A point where three or more edges of a polyhedron intersect

Back

Vertex

Tags

CCSS.6.G.A.4

Front

A polyhedron that has two parallel, identical bases. The lateral faces are parallelograms.

Back

Prism

Tags

CCSS.1.G.A.1

CCSS.2.G.A.1

Front

A flat surface that extends infinitely in all directions

Back

Plane

Tags

CCSS.HSG.CO.A.1

Front

A closed figure formed by a finite number of line segments

Back

Polygon

Tags

CCSS.2.G.A.1

Front

A polygon with four sides

Back

Quadrilateral

Tags

CCSS.2.G.A.1

Front

A triangle with one angle measuring more than 90°

Back

Obtuse triangle

Tags

CCSS.4.G.A.2

Front

A triangle with all sides of different lengths

Back

Scalene triangle

Tags

CCSS.4.G.A.2