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B. Write T if the statement is true and F if it is false.
1. The base of a cone is square.
2. A cylinder has a circular base.
3. The base of an octagonal pyramid has 7 sides.
4. A pyramid has a triangular face.
5. A cube has six faces.
6. A sphere is a plane figure.
7. A cone has no vertex.
8. A rectangular pyramid has square faces.
9. Spatial figures are three-dimensional figures.
10. The faces of a prism are triangles.​