A 3-sided shape is called a triangle.
or Polygon in general.
Septagon or Heptagon = seven sided shape
A 3 sided shape is a triangle. A 4 sided shape could be a square or rectangle.
Shapes with 12 to 20 sides are named as follows: a 12-sided shape is called a dodecagon, a 13-sided shape is a triskaidecagon, a 14-sided shape is a tetradecagon, a 15-sided shape is a pentadecagon, a 16-sided shape is a hexadecagon, a 17-sided shape is a heptadecagon, an 18-sided shape is an octadecagon, a 19-sided shape is a nonadecagon, and a 20-sided shape is an icosagon.
A 4 sided shape is classified as a quadrilateral.
A 4 sided shape has 4 vertices whereas a 3 sided shape has 3 vertices.
Septagon or Heptagon = seven sided shape
A 3 sided shape is a triangle. A 4 sided shape could be a square or rectangle.
Answer: nonagon.
a PENTAGON
Shapes with 12 to 20 sides are named as follows: a 12-sided shape is called a dodecagon, a 13-sided shape is a triskaidecagon, a 14-sided shape is a tetradecagon, a 15-sided shape is a pentadecagon, a 16-sided shape is a hexadecagon, a 17-sided shape is a heptadecagon, an 18-sided shape is an octadecagon, a 19-sided shape is a nonadecagon, and a 20-sided shape is an icosagon.
a 3 sided shape is a right angle triangle
A 4 sided shape is classified as a quadrilateral.
A 6-sided shape is one kind of polygon. It can also be called a hexagon.
A 4 sided shape has 4 vertices whereas a 3 sided shape has 3 vertices.
An octagon is an 8 sided 2 dimensional shape. A cylinder with the base of a hexagon (6 sided shape) would be an 8 sided 3 dimensional shape.
3 sided shapes are triangles
A shape in 2D with n sides is called an n-gon. In higher dimensions, a shape with n sides is called an n-sided polyhedron.