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

It seems that I am unable to create sketches directly. However, I can describe how to draw each of the requested figures step by step. ### a) Concave Hexagon 1. Start by drawing a hexagon with six sides. 2. Make one of the interior angles greater than 180 degrees, which will create a "dent" in the shape. 3. Ensure that the other angles remain less than 180 degrees. ### b) Convex Pentagon 1. Draw five straight lines to form a pentagon. 2. Ensure that all interior angles are less than 180 degrees, making the shape bulge outward. ### c) Simple but Not Closed Planar Figure 1. Draw a continuous line that does not intersect itself but does not return to the starting point. 2. For example, you can create a spiral or a simple open curve. ### d) Kite 1. Draw two pairs of adjacent sides that are equal in length. 2. The kite should have one pair of opposite angles that are equal. 3. The shape should resemble a diamond or a flying kite. ### e) Non-Square Rhombus 1. Draw a quadrilateral with all sides of equal length. 2. Ensure that the angles are not 90 degrees, making it a rhombus but not a square. ### f) Right Trapezoid 1. Draw a trapezoid with one pair of parallel sides. 2. Ensure that one of the non-parallel sides is perpendicular to the parallel sides, creating a right angle. If you need further assistance or specific details about any of these shapes, feel free to ask!