It is a volume (3D) shape - "solid" has nothing to do with it.
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False
Sphere * * * * * Not true. A sphere does have a curved face. A point has none.
True. The radius is half the diameter.
False. A solid figure that cannot roll does not necessarily have faces. The ability to roll is determined by the shape and symmetry of the figure, not by the presence of faces. For example, a sphere is a solid figure that cannot roll, but it does not have faces.
it depends on its shape. if it is a parallelogram, then its true. but if it is a trapezoid, then eventually not.