Mathematical Shapes

Polygons are 2 dimensional geometric shapes that has 3 and more straight sides that are bound as a close plane figure. This geometric shapes (below this text) is an introduction to polygons the shows the 3 sided and 12 sided. 

This is the Triangle and this has 3 sides. The internal angles are 60 degrees.

This is the Square and this has 4 sides. The internal angles are 90 degrees.

This is the Pentagon and this has 5 sides. The internal angles are 540 degrees.

This is the Hexagon and this has 6 sides. The internal angles are 120 degrees.

This is the Heptagon and this has 7 sides. The internal angles are 128.57 degrees.

This is the Octagon and this has 8 sides. The internal angles are 135 degrees.

This is the Nonagon and this has 9 sides. The internal angles are 140 degrees.

This is the Decagon and this has 10 sides. The internal angles are 144 degrees.

This is the Hendecagon and this has 11 sides. The internal angles are 147.273 degrees

This is the Dodecagon and this has 12 sides. The internal angles are 150 degrees.

This are all the 2 Dimensional Geometric shapes that has 3 and more straight sides. 

Equilateral Triangle is a triangle in which all three sides are equal. All three internal angles are also congruent to each other and each are 60 degree. 

In Geometry, Quadrilateral can be defined as a closed, two-dimensional shape which has fours straight sides. The Polygons has for vertical or corners.

A Rhombus is a flat shape with 4 equal straight sides. A rhombus looks like a diamond. All sides have equal length. Opposite sides are parallel, and opposite angles are equal. The altitude is the distance at right angles to two sides.