6.Verify Euler’s formula for these solids.

(i) In this given figure we have,

F = 7, V = 10, E =15

∴ F + V =7 + 10 = 17 and E + 2 =15 + 2 = 17

\(\Rightarrow\) F+V=E+ 2

Thus, Euler’s formula is verified.

(ii) In this given figure,

F =9, V = 9,E =16

∴ F + V =9 + 9 =18 and E + 2 =16 +2 =18

\(\Rightarrow\) F + V =E + 2

Thus, Euler’s formula is verified.