The aim of this study was to assess the combined effects of the synthetic cannabinoid agonist nabilone and Î´ 9 -tetrahydrocannabinol (Î´ 9 -THC) using drug-discrimination procedures, which are sensitive to drug interactions.
Pentagonal Prism. In a prism there are two equal and similar end faces, parallel to each other, joined together by other rectangular faces. In some cases, the faces joining the end faces may be parallelograms instead of rectangles. There are many types of Prism, and they are named after the shape of their base. A prism having pentagonal base faces is called a pentagonal prism. It is a type of heptahedron with 7 faces, 15 edges, and 10 vertices.
The prism shown below, which has an octagon as its base, does have ten faces, but the number of vertices here is sixteen. The pyramid, which has a 9-sided base, also has ten faces, but has ten vertices. But Euler's formula tells us that no simple polyhedron has exactly ten faces and seventeen vertices. Figure 6: Both these polyhedra have ten faces, but neither has seventeen vertices.