Answer:
1.B
2.B
3.B
Step-by-step explanation:
1.In geometry, a cube is a three-dimensional solid object bounded by six square faces, facets or sides, with three meeting at each vertex. The cube is the only regular hexahedron and is one of the five Platonic solids. It has 6 faces, 12 edges, and 8 vertices.
2.Definition. In mathematics, a cylinder is a three-dimensional solid that holds two parallel bases joined by a curved surface, at a fixed distance. These bases are normally circular in shape (like a circle) and the center of the two bases are joined by a line segment, which is called the axis.
3.Image result for SURFACE CONE
Since the flat surface of a cone is circular, the formula for the flat surface of the cone is πr2 square units. It is also called the base surface area of a cone.
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