6. Verify Euler’s formula for these solids.
(i) Euler formula F+V = E + 2.
So, Number of faces (F) = 7, Number of vertices (V) = 10 and number of edges (E) = 15.
Hence putting in the formula; we get,
7 + 10 = 15 + 2
17 = 17 hence, it satisfies the Euler formula.