Two Dimensional
Two dimensional shapes only have height and width, and are flat. They are often referred to as 2D shapes.. There are many different two dimensional shapes.
Polygons
A polygon is a close figure with three or more line segments. The number of sides that a polygon can have goes on forever!
Polygons by Sides
Three- Triangle
Four-Quadrilateral
Five-Polygon
Six-Hexagon
Seven-Heptagon
Eight-Octagon
Nine-Nonagon
Ten-Decagon
Triangles
Types of Triangles by length of sides:
Equilateral- the sides are three equal lengths
Isoscles- two fo the sides are equal in length
Scalene- all of the sides have different lengths
Types of Triangles by angle size:
Right- one of the three angles measures to be exactly 90 degrees
Acute- all angles measure to be less than 90 degrees
Obtuse- one angle measures to be greater than 90 degrees
Quadrilaterals
Quadrilaterals are polygons that have four sides. There are various types of quadrilaterals including:
Square
Rectangle
Rhombus
Parallelogram
