It is a quadrilateral.
a triangle.
A nonagon is a nine-sided polygon.
It looks like a square with a triangle on top of it.
10 sides 10 corners (vertices), no intersecting lines a closed figure.The sides&angles are not necessarily equal, unless a regular polygon is specified. A five-pointed staractually is a 10-sided polygon (There are 5 vertices pointing 'out' and 5 pointing 'in').
A polygon
it look like a fifty sided shape
Like this
see related link below to see the 20 sided polygon
polyhedron
a triangle.
It is a seven-sided polygon
The Pentagon.
It is a quadrilateral.
It looks like a circle
A nonagon is a nine-sided polygon.
Join up the hour-markers on a clock face and you will have a dodecagon - a 12 sided polygon.