There is no such shape since there are no triangler surfaces - there is no such word! You might like to spell check your question before posting it!
The correct word is triangular.
And, incidentally, the answer to the question is a triangular prism - NOT a TRIANGLER prism!
a rectangular prism, which is a 3D rectangle.
flat surfaces on any polyhedron are called faces
One - a rectangle is a flat shape - not a three dimensional object !
a sphere, of course!
Because of the dimensions of the cylinder, once shadowed, the shadow resembles a rectangle due to the flat top of the cylinder and the smooth surfaces.
a rectangle
It has three shapes. Two surfaces are flat circles and one is a curved rectangle.
a rectangular prism, which is a 3D rectangle.
There can be no such shape. If there were a shape with n flat surfaces, then if you sliced off one vertex, you would have a shape with n+1 flat surfaces. So it is always possible to add one more flat surface.
a rectangle
flat surfaces on any polyhedron are called faces
A sphere
cube There are a great many solid shapes that have only flat surfaces.
A cube
a cylinder
rectangle
Five: Four sides and the base.