An heptagon has 7 interior angles that add up to 900 degrees
No. A heptagon has 7 sides, so it has 7 angles; thus it cannot have 10 right angles.
A heptagonal what? Prism, pyramid or something else?
Heptagonal is an adjective, not a noun! The answer will depend on whether you mean a heptagonal pyramid, a heptagonal bipyramid, a heptagonal prism or whatever.
7
Nine.
Heptagonal is an adjective: the answer depends on the noun that it refers to. A heptagonal pyramid, a heptagonal dipyramid or a heptagonal prism or some other heptagonal shape?
No. A heptagon has 7 sides, so it has 7 angles; thus it cannot have 10 right angles.
there is 13 edges in a heptagonal pyramid.
An heptagonal based prism, also known as a heptagonal prism, has two faces that are perpendicular to each other. These faces are the bases of the prism, which are heptagons in this case. The perpendicular edges are the edges that connect the vertices of the bases at right angles, resulting in a total of 14 perpendicular edges in a heptagonal prism.
a heptagonal pyramid has 8 faces
A heptagonal what? Prism, pyramid or something else?
A heptagonal prism has two 7-sided bases.
Heptagonal is an adjective, not a noun! The answer will depend on whether you mean a heptagonal pyramid, a heptagonal bipyramid, a heptagonal prism or whatever.
7
21
Nine.
14 vertices