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What is the shape of the Department of Defense buliding?
The Pentagon has the geometric shape of a pentagon (It is a polygon with five interior angles and five equal sides).
How many faces does a rectangular shape have?
Well a rectangle is a 2-D shape so it really only has 1 face and 4 sides
Do unusual shapes and normal shapes have the same name if they have the same number of sides?
Yes. For a given number of sides, you can have "regular" polygons where all sides are of the same length, and "irregular" polygons with different lengths and angles. A "concave" polygon is one having interior angles greater than 180°, so that line segments fall between two other points on the shape, such as a tetragon formed as a nested letter V.
How many sides does a polyhedron have?
A polyhedron is a solid shape with many sides. The word "polyhedron" does not specify a number of sides.
What a figure is not a polygon?
A sphere as a polygon is a shape with three or more sides and a sphere has no sides
