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61. What do we call a polyhedron whose base is a polygon of any number of sides and whose other faces are triangle with a common vertex?

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62. What kind of polygon is the base of a tetrahedron?

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63. What do we call a solid whose side faces are parallelograms and whose bases (ends) are congruent parallel rectilinear figures?

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64. What do we call a quadrilateral prism, whose ends are parallelograms?

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