A geometric shape that has 11 sides is called a "hendecagon" or "undecagon." Both terms are acceptable.
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A geometric shape with only one set of parallel sides is a trapezoid.
A hexahedron is a three-dimensional geometric shape having six sides; a hexagon is a two-dimensional six-sided shape.
It is called a parallelogram. or a square........ or a rectangle.........
dodecagon * * * * * NO! That is 12 sides. 11 sides is a hendecagon.
A geometric shape with 4 sides and 4 vertices is a 4-sided figure, a quadrilateral.