An heptagon has 7 interior angles that add up to 900 degrees
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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.