4. Sketch the following: \( \begin{array}{ll}\text { a) a concave hexagon } & \text { b) a convex pentagon } \\ \text { c) a planar figure that is simple but not closed } & \text { d) a kite } \\ \text { e) a non-square rhombus } & \text { f) a right trapezoid }\end{array} \)

Here's how to sketch each figure: a) **Concave Hexagon**: Draw a six-sided shape with one angle greater than 180 degrees, creating a dent. b) **Convex Pentagon**: Draw a five-sided shape with all angles less than 180 degrees, making it bulge outward. c) **Simple but Not Closed Planar Figure**: Draw a continuous line that doesn't intersect itself and doesn't return to the starting point, like a spiral. d) **Kite**: Draw a four-sided shape with two pairs of adjacent sides equal and one pair of opposite angles equal, resembling a diamond. e) **Non-Square Rhombus**: Draw a four-sided shape with all sides equal but angles not 90 degrees. f) **Right Trapezoid**: Draw a four-sided shape with one pair of parallel sides and one non-parallel side perpendicular to the parallel sides, creating a right angle. If you need more details on any of these, let me know!