Use Euler’s formula to find the number of vertices in the polyhedron described below.

 

Use Euler’s formula to find the number of vertices in the polyhedron described below.
 
5 faces: 1 rectangle and 4 triangles
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V-E+F=2 is Euler's formula, where V, E and F are the numbers of vertices, edges and faces of a convex polyhedron.

F=5, E=8 (sides of rectangle and pyramid of 4 triangles), so V-8+5=2 and V=5.
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