Concave is a property of [irregular] polygons. A parallelogram cannot be concave.
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A rhombus is an equilateral parallelogram. As such, it is neither concave nor convex.
A rhombus is an equilateral parallelogram. As such, it is neither concave nor convex.
The remaining shape could be a [concave] hexagon although in some circumstances it could be a smaller parallelogram.
Yes, it is possible to draw a quadrilateral that is neither a trapezoid nor a parallelogram. One example is a kite, which has two pairs of adjacent sides that are equal in length but does not have parallel sides. Another example is a concave quadrilateral, where at least one of the interior angles is greater than 180 degrees, making it neither a trapezoid nor a parallelogram.
no concave mirror is in shape of concave mirror