No. Like all polygons, a heptagon is a 2-dimensional closed figure.
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No, because a polyhedron is a solid with many flat faces. A heptagon is not a 3-D figure. However, a pyramid or prism would be a polyhedron.
In 2-d, a heptagon.
A heptagon has seven sides and a quadrilateral has four, so 1 heptagon and 3 quadrilaterals have 1*7 + 3*4 = 7 + 12 = 19 sides altogether.
You can have 0, 1, 2, or 3 pairs of parallel sides in a heptagon.
If the heptagon is regular the angle measurement for three angles would be approximately 385.7