A triangular pyramid - one with four faces, each face being a triangle.
All 4 sided quadrilaterals have 4 vertices
Tetrahedron: 4 equilateral triangle faces and 4 vertices.
Quadrilateral
A geometric shape with 4 sides and 4 vertices is a 4-sided figure, a quadrilateral.
a tetrahedron
A triangular based pyramid has 4 faces and 4 vertices
A tetrahedron
A quadrilateral has 4 vertex, sides, angles.
Square
That depends on the figure. A regular tetrahedron, for example, has four vertices.
Number of vertices in the plane figure = 4.
There is no such polyhedron.