6. Verify Euler’s formula for these solids.
(ii) Euler formula F+V = E + 2.
So, Number of faces (F) = 9, Number of vertices (V) = 9 and number of edges (E) = 16.
Hence putting in the formula; we get,
9 + 9 = 16 + 2
18 = 18 hence, it satisfies the Euler formula.