A right regular n-gon pyramid has 28 edges.

(a) What n-gon is it? Show your work.
(b) How many faces does the pyramid have?
(c) How many vertices does the pyramid have?


N-gon pyramids have 2n edges; n = 14, n + 1 vertices, V = 15, n + 1 faces F = 15. Check with
Euler’s formula: 15 + 15 = F + V = E + 2 = 30.

(a) n = 14
(b) F = 15
(c) V = 15

Mathematics

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