B. The type of polygon described is known as concave heptagon.
What is concave heptagon?
In a concave heptagon, one or more interior angles are greater than 180 degrees and some diagonals lie outside the polygon.
A polygon with 7 sides is known as heptagon and when an angle goes inside of the shape it is known as concave heptagon.
Thus, the type of polygon described is known as concave heptagon.
Learn more about concave heptagon here: https://brainly.com/question/8496460
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