2007-01-07 11:20:19 · 4 answers · asked by angleann16 1 in Science & Mathematics ➔ Mathematics
For the surface area of a heptagon, dissect it into 7 triangles. If it's a regular heptagon you can use the general formula for a regular n-gon. This is...
"Area = na^2 cot(alpha/2)/4
where n is the number of sides and a is the length of a side. The
angle alpha is 360/n. "
(from http://mathforum.org/library/drmath/view/55149.html)
A heptagon, as a two dimensional figure, does not have a volume. However, for the volume of a prism with straight sides and a heptagon base, multiply the area of the base times the height.
2007-01-07 11:38:23 · answer #1 · answered by Joni DaNerd 6 · 0⤊ 0⤋
A heptagon is a 2 dimensional figure. It is a polygon with seven sides. So it has area, not volume.
2007-01-07 19:25:08 · answer #2 · answered by Northstar 7 · 0⤊ 0⤋
A regular heptahedron consists of 3 square faces and 4 equilateral triangle faces, all with the same side length. The surface area, therefore, for a heptahedron of side of 1 is
3 + 4(1/4)(Sqrt(3)) = 3 + Sqrt(3)
However, being a one-sided polyhedron, it encloses no volume, so the volume of a heptahedron is 0.
2007-01-07 20:16:08 · answer #3 · answered by Scythian1950 7 · 0⤊ 0⤋
heptagon is a plane, polygon with 7 sides
volume and surface area are for spatial figures only!
2007-01-07 19:35:47 · answer #4 · answered by kimjay_lmr01 1 · 0⤊ 0⤋