Geometry Basic Vocab - 3rd grade

Front

2D, closed shape with 4 sides and 4 right angles, and opposite angles that are equal

Back

rectangle

Front

2D closed shape with 3 sides

Back

triangle

Front

A point, corner, or angle

Back

vertex

Front

Four equal sides and angles

Back

square

Front

2D closed shape with 6 sides

Back

hexagon

Front

type of parallelogram where each pair of opposite sides are equal in length

Back

rhombus

Front

any closed 4-sided shape

Back

quadrilateral

Front

any 2D closed shape with straight sides and angles

Back

polygon

Front

polygon with 2 pairs of parallel sides and not all sides are congruent

Back

parallelogram

Front

a 2D shape with 5 sides

Back

pentagon