## 2D Shapes – Names and Properties

Definition and Properties

2-dimensional shapes have 2 dimensions length and width.

Rectangle

A rectangle is a 2-dimensional 4 sided polygon.
A rectangle have 4 sides, 4 angles and 4 vertices. The total of 4 angles is 360 degree.

Square

A square is a 2-dimensional 4 sided polygon.
A square have 4 sides, 4 angles and 4 vertices.
The total of 4 angles is 360 degree.

Circle

A circle is a closed 2-dimensional figure.
A circle is a collection of all the points in a plane, whose all points are same distance from a fix point. The fixed point is called the centre of the circle, and the distance between centre and any point on the circle is called the radius of the circle.

Triangle

A triangle is a 2-dimensional 3 sided polygon.
A triangle have 3 sides, 3 angles and 3 vertices.
The total of 3 angles is 180 degree.

Right Triangle

A right triangle is a 2-dimensional 3 sided polygon.
A right triangle have 3 sides, 3 angles and 3 vertices. One angle of right triangle is right angle or 90 degree and the total of 3 angles is 180 degree.

Parallelogram

A parallelogram is a 2-dimensional 4 sided polygon.
A parallelogram have 4 sides, 4 angles and 4 vertices.
The total of 4 angles is 360 degree.
Opposite side of a parallelogram is equal and parallel.
Opposite angles of a parallelogram is equal.

Trapezium

A trapezium is a flat closed figure in which one pair of opposite sides are parallel.  The total of all interior angles are 360 degree.

Rhombus

A rhombus is a quadrilateral (closed shape, plane figure) with four straight sides that are equal length also opposite sides are parallel. Opposite interior angles of a rhombus are equal.

Pentagon

A pentagon is a geometrical shape(polygon) has 5 sides, 5 vertices and 5 angles.
The sum of all interior angles of a pentagon is 540  degree.

Oval

An oval is a closed curve in a plane looks like an eg or ellipse. An oval has no straight sides and no corners. An oval has one face.

Hexagon

A hexagon is a geometrical shape(polygon) has 6 sides, 6 vertices and 6 angles. The sum of all interior angles of a hexagon is 720  degree.

Heptagon

A heptagon is polygon(closed shape with 7 straight sides).
A heptagon has seven straight sides, 7 angles and 7 corners i.e. vertices.
A heptagon is known as septagon.
The sum of all interior angles of a heptagon is 900  degree.

Octagon

An octagon is a geometrical closed figure which is made by eight straight lines. An octagon has eight straight sides, 8 angles and 8 corners i.e. vertices. The sum of all interior angles of a octagon is 1080 degree.

Decagon

A decagon is a geometrical closed figure which is made by ten straight lines.

A decagon has ten straight sides, ten angles and ten corners i.e. vertices. The sum of all interior angles of a decagon is 1440  degree.

Dodecagon

As the name says, the twelve sided polygon is known as dodecagon.
A dodecagon is a geometrical closed figure which is made by twelve straight lines. A dodecagon has twelve straight sides, twelve angles and twelve corners i.e. vertices. The sum of all interior angles of a dodecagon is 1800  degree.