A rectangular pyramid (four-sided base) has 5 faces and 5 vertices.
A square based pyramid
Pyramid
A solid figure with twenty faces is called an Icosahedron.
a pyramid, in the sense that most people think of has a square base, with 4 triangle 'sides', which would be 5 faces. A regular tetrahedron has 4 equilateral triangles as faces.
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a pyramid
A rectangular pyramid (four-sided base) has 5 faces and 5 vertices.
a rectangular pyramid rectangular base and 4 triangular sides = 5 faces
You are a square based pyramid that has 5 faces, 8 edges and 5 vertices.
A square based pyramid
square pyrimad
A polyhedron is any 3D solid (such as a cube) - therefore, it can have any number of faces.
Despite the blind answer of many uneducated users of this site, a pentagon is 2 dimensional with 5 SIDES, thus not a solid figure. A pentahedron, though, is a solid figure of five FACES. PENTAHEDRON
Pyramid
square pyramid rectangular prism
The Pyramid