4 at the base and 1 at the top
A trapezium has 4 corners and it is a 4 sided quadrilateral
it is a 4 sided polygon with 4 corners.
If you mean the base has 4 sides then the pyramid is a square based pyramid and has 5 corners. If you mean the pyramid has 4 faces then the pyramid is a tetrahedron with a triangular base and has 4 corners.
There isnt one
0 or 4 corners
A trapezium has 4 corners and it is a 4 sided quadrilateral
4
it is a 4 sided polygon with 4 corners.
If you mean the base has 4 sides then the pyramid is a square based pyramid and has 5 corners. If you mean the pyramid has 4 faces then the pyramid is a tetrahedron with a triangular base and has 4 corners.
There isnt one
It has 4 corners
A rectangle has 4 corners.
It has 4 corners
A trapezoid has 4 corners and 4 sides
0 or 4 corners
A rhombus or a kite are two 4 sided quadrilaterals that have no square corners.
360 degrees as its a four sided shape