verify using EULER'S FORMULA
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1.hexagonal prism
faces =8
vertices =12
edge =18
F+V=E+2
8+12=18+2
20=20
2.pentagonal prism
faces =6
vertices=6
edge=10
F+V=E+2
6+6=10+2
12=12
3.rectangular Pyramid
faces =5
vertices=5
edges=8
F+V=E+2
5+5=8+2
10=10
faces =8
vertices =12
edge =18
F+V=E+2
8+12=18+2
20=20
2.pentagonal prism
faces =6
vertices=6
edge=10
F+V=E+2
6+6=10+2
12=12
3.rectangular Pyramid
faces =5
vertices=5
edges=8
F+V=E+2
5+5=8+2
10=10
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