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numbers and algebraic expressions
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function and its properties
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polynomials
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trigonometry
plane geometry
analytic geometry
solid geometry
combinatorics
probability
elements of statistics
kropki game

a, b, c, d - length of edges of a base, H - height. The hexagonal pyramid has 7 faces, 12 edges, 7 vertices. Angles in hexagonal pyramid. Regular hexagonal pyramid has in base pentagon and its height drop directly onto center of the base. All three lateral faces of this pyramid are isosceles triangles. The volume and the surface find in the same way as all pyramids: V = 1/3A_bH, S = A_b + A_l. H - height, A_b - base area (hexagon), A_l - lateral surface area (sum of areas of triangles.