Question

Using Euler's formula find the value of unknown x and y.
faces = 7, y
vertices = 10, 12
edges = x, 18​

Answer 1

Answer:

E=30

Step-by-step explanation:

Solution 7: (i) Faces-?,vertices-6,edges-12

Euler's formula: F+V–E=2

F+6–12=2

F=2+12–6=8

F=8

(ii) Faces-5,vertices-?,edges-9

Euler's formula: F+V–E=2

5+V–9=2

V=2+9–5=6

V= 6

(iii) Faces-20,vertices-12,edges-?

Euler's formula: F+v–E=2

20+12–E=2 ,

E=20+12–2

E=30