Can a cone have a triangle as a face? This 3rd grade flat and curved faces worksheet asks that kind of question. A table shows five drawn solids: a cylinder, a cone, a cube, a sphere and a triangular prism. First, your child writes the name of each shape, and next answers yes or no to short questions about the shapes of its faces. Finally, a last column asks for a reason in one sentence. Page two is the answer key, with every name, answer and reason written out.