Two dimensional shapes can have straight lines or curved lines.

A 2D shape has no thickness, and only two dimensions such as height and width.

They are also known as 2D shapes.

Many two dimensional shapes are also classified as polygons.

A plane shape which is a closed, two-dimensional shape is a 2D shape. They vary according to the numbers of sides or vertices.

Many 2D shapes are named according to their number of vertices. A vertex is where two sides meet. If you draw a line from two vertices that are not next to each other, this line would be called a diagonal. ( See below )

When placed on a sheet of paper, 2D shapes lay flat.

Ellipse A closed loop formed by a curved line. The distance from A to C plus B to C will be constant regardless of the location of C on the curved line.

A

C

B

Common Core Standard 5.G.B.3 5.G.B.4

Keywords: Two dimensional figures,attributes, classify

Scalene triangles have three different side lengths and three different angle measures

Isosceles triangles have at least two equal sides and two equal angle measures

Equilateral triangles have equal sides and angles.

A rectangle is a shape with four sides and four vertices

A square is a rectangle in which all four sides are equal length and create four ninety degree angles

A circle is a round shape that has no sides or corners and is not a polygon, but is a 2D shape.

A parallelogram has four sides, four vertices, and two parallel sides

A quadrilateral has four sides, four vertices, and two diagonals. There are many types of quadrilaterals. Check here for a chart of the quadrilateral family.

A rhombus has four sides, four vertices, and four equal sides.

A trapezoid has four sides, four vertices, and exactly one pair of parallel sides.

Click on the 2 dimensional shape for more information

Click on the shape for more information

2 Dimensional Polygon Shapes

What is a 2 dimensional shape? A shape that has only two dimensions such as width and height, but has no thickness is considered a two dimensional shape. Polygons are 2D shapes.

25 Names of 2D Shapes

Circle: Round Shape

Right Triangle: 3 sides 1 90 degree angle

Rhombus: 4 sides opposite angles equal

Trapezoid: 4 sides opposite are parallel

Pentagon: 5 sides

Hexagon: 6 sides

Octagon: 7 sides

Nonagon: 9 sides

Decagon: 10 sides

Star: a polygon formed by extending the sides of a pentagon

Diamond: also called a rhombus

Crescent: (looks like a sliver of the moon)

Semi-circle: half of acircle

All quadrilaterals: 4 sided polygons

Arrows: also called a dart

Convex polygon: no internal angles 180 degrees or greater

Concave polygon: at least one internal angle greater than 180 degrees

Dart: a concave dart

Kite: a 4 sided polygon

Triangle: 3 sided 2d shape

Disc: a circular shape

Circumcircle: the middle of the circle that touches the three vertices of a triangle

Indalo: a prehistoric magical symbol

Lune: two overlapping circles

Oval: think of an egg

This list is just the tip of the iceberg for two dimensional shapes.